diaphemetric 
tactiU' sciisiliility of parts: as, ditiplicmetric 
compasses. 
diaphonic, diaphonical (d!-*-fon'ik, -i-k;iij. & 
[< Gr. dtdtfuiix;, dissonant, discordant, taken in 
lit. sense of ' sounding t lirough or across,' < din, 
through, across, + Quvi/, a sound.] Same as 
diaphoniCS (di-a-fon'iks), n. [PI. of diaphonic : 
see -ics.] Same us diai'iiuistica. 
diaphony (di-af'o-ni), n. [< Gr. dia$uvia } dis- 
sonance, discord, < St&Quvof, dissonant, discor- 
dant: see diapkoitic. Of. symphony.] 1. Inane. 
(!r. Mimic, a dissonance: distinguished from 
si/Hiphnni/. 2. In nii'thi fa! music, the earliest 
and crudesl form of polyphony, in which two, 
three, or four voices proceeded in strictly par- 
allel motion, at such intervals with one another 
as the octave, the fifth, and the fourth. Also 
called organum. 
diaphoresis (di'a-fo-re'sis), n. [LL., perspira- 
tion, < Gr. dttut>6pt/aif, a carrying off, perspira- 
tion, < diatt>opeiv, spread abroad, carry off, throw 
off by perspiration, < did, through, + Qopelv, 
carry, freq. of ijiepeiv = E. bear*.] In med., 
perspiration, especially when artificially pro- 
duced. 
The insensible halitus, when in a quantity to lie con- 
densed, and ill this state sensible to the feelings, is the 
((m/,/,,,,,...,,. 1'arr, Med. Diet. (Ord Ms.). 
diaphoretic (dFa-fp-ret'ik), a. and n. [< Gr. 
tajofjrattc, promoting perspiration, < dtaijaptlv, 
throw off by perspiration : see diaphoresis.] I. 
o. Promoting or increasing perspiration; sudo- 
rific. 
A diaphiirelick medicine, or a sudorittck, is something 
that will provoke sweating. Wattg. 
Diaphoretic antimony. See antimony. 
II. n. A medicine which promotes perspira- 
tion; a sudorific. 
Diaphoretickg, or promoters of perspiration, help the or- 
gans of digestion, because the attenuation of the aliment 
makes it j>erspirable. Arbitthiwt. 
diaphorctical (di"a-fo-ret'i-kal), a. Same as 
diaphoretic. 
diaphorite (di-af'o-rit), n. [< Gr. dtdtjio/mf, dif- 
ferent (< dta<j>epeiv, differ: see differ), + -ite%,] 
A mineral having the same composition as 
freieslebenite, but crystallizing in the ortho- 
rhombic system. 
diaphragm (di'a-f ram), n. [< F. diaphragme = 
8p. diajrai/ma = Pg. diaphragma = It. diafrag- 
<!,< LL. diaphragma, < Gr. didfpayua, a parti- 
tion-wall, barrier, the midriff, diaphragm, < 
diatfipayvvvai, separate by a barrier, barricade, 
< did, between, + <j>payvvvai, equiv. to the more 
common ippdaoeiv, fence, inclose, = L. farcire, 
stuff, whence ult. E. farce and/brce3, q. v.] 1. 
A partition ; something which divides or sepa- 
rates. Specifically 2. In mech. : (a) A thin 
piece, generally of metal, serving as a parti- 
tion, or for some other special purpose : as, the 
vibrating diaphragm of a telephone, for the 
communication of transmitted sounds, (b) A 
ring, or a plate pierced with a circular hole so 
arranged as to fall in the axis of the instru- 
ment, used in optical instruments to out off 
marginal beams of light, as in a camera or a 
telescope. Such diaphragms are often made movable, 
especially for photographic lenses, so that one with a large 
opening may be inserted when it is desired to admit abun- 
dant light to the lens, in order to use a short ex|H>suie, 
and one with a small opening when sharpness of detail is 
more desirable than shortness of exposure. 
3. Iii mint., the midriff; the musculomembra- 
nous partition which separates the thoracic 
from the abdominal cavity in mammals, in man 
the diaphragm consists of a muscular sheet whose fibers 
1 .-,'.!.-, 
radiate from a trcfoiltcndiiiousceMtcr to attach themselves 
to the lower tuiirjjinsof the thorax, ami behind form a ];u .- 
bundle orieillirr Mile, callei I /-I//"/-.,',,/ r/,,,/on'/</'<(<//ii. I hr 
diaphragm I* pierced l>y tint principal opening*: t!' 
]>liit:r>'il!. tor the passage of Ihr esophagi* an pallicd 
hy the pncilmogastric nerves; the aorln-, i..r Hi, passage 
nt the aorta, thoracic duct, and large azygous vein ; ami 
the ctirttl, for the inferior vena cuva ; besides some others 
for sphuirhiik- nerves, etc. The diaphragm is invested on 
its thoracic surface by the pleural and pericardia! serous 
membranes ; on its abdominal surface by the peritoneum, 
a fold of \\liirli. reflected upon the liver, forms the sus- 
pensory ligament of that organ. The diaphragm is deep- 
ly roiieavn-convex, the convexity upward; the general 
figure is that of an umbrella. It is a powerful respiratory 
muscle, contracting at each inspiration and so flattening, 
while Its relaxation in expiration renders it more COMMA ; 
its contraction also assists in defecation and in parturi- 
tion, and ita spasmodic action is concerned in hiccough 
and sneezing; when most relaxed it rises to the level . f 
aiiont the fifth rib. A rudimentary diaphragm exists in 
birds ; It Is best developed in the apteryx. 
4. In cryptogamic hot., in Equisetum, a trans- 
verse partition in the stem at the node ; in Se- 
/(if/inella and its allies, a layer separating the 
prothallium from the cavity of the macrospore ; 
in Characece, a constriction formed by the en- 
veloping cells near the tip of the oBgonium. 
6. In conch., a septum or shelf-like plate ex- 
tending into the cavity of a shell, more or less 
partitioning it. Ala of the diaphragm. Seeola. 
Crura of the diaphragm. See cm*. Iris dia- 
phragm, n form of diaphragm used with lenses, in which 
the size of the aperture is varied at will, and at the same 
time kept nearly circular by the simultaneous motion 
of a large number of small shutters. Ligaments of 
the diaphragm, the internal and external arcuate lig- 
unientous bftruer of the mammalian diaphragm, where it 
arches over the psoas and qtiadratus lumliorum muscles. 
Pillars of the diaphragm. See def. s. Revolving 
diaphragm, in optic*, a lens-diaphragm consisting of a 
disk pierced with holes of various diameters, and pivoted 
in such a position that by rotating it any opening desired 
may be brought in line with the axis of the lens. Trefoil 
Of the diaphragm, the three leaflets into which the mus- 
culoniembranoua part of the diaphragm is disposed. 
diaphragmal (di-a-frag'mal), a. [< diaphragm 
(LL. diaphragma) + -o/.J 1. Partitioning or 
separating, as a partition between two cavities ; 
septal. 2. Same as diaphragmatic. 
diaphragmalgia, diaphragmalgy (di'a-frag- 
mal'ji-a, -ji), ti. [NL. diaphraynialgia, < Gr. 
did<t>i>a)-/ta, diaphragm, + d/.yof, pain.] Pain in 
the diaphragm. 
diaphragmatic (di"a-frag-mat'ik), a. [< LL. 
ditiphragma(t-), diaphragm, 4- -ic.] Of or per- 
taining to the diaphragm. Also diaj>hragmal. 
Diaphragmatic foramina. See/ora,/in. Diaphrag- 
matic ganglion. Hee0aii</n. Diaphragmatic gout. 
Same as angina pectorU (which see, under angina). 
diarian 
diapnoet (di-ap'no-e), n. [< Gr. tianvoii, a pas- 
sage, outlet, evaporation, perspiration, < dia- 
irveiv, blow through, < i!w, through, -f- irveiv, 
blow.] Sweating; pers]>iratiou. A'. I'hillipx, 
1706. 
diapnoic (di-ap-no'ik), o. and n. f= P. dinpim- 
i'/i't ; as diujnioe + -ic.] I. . In un-il., pro- 
ducing a very slight, insensible perspiration; 
gently diaphoretic. 
H. n. A remedial agent which produces a 
very sljght, insensible perspiration ; a mild dia- 
phoretic. 
diapnotic (di-ap-not'ik), a. [< Gr. duurvof/. pas- 
sage, outlet, perspiration (see diuimoe), 4- -vt- 
-ic. ] Promoting gentle perspiration. 
ing the morphological character of a diapophy- 
sis : as, a diapophyxial process ; the diapophynial 
element of a vertebra. Oeol. Jour. 
diapophysis (di-a-pof'i-sis), n. ; pi. diapophyses 
(-sez). [NL., <" Gr. Ad, through, + 
VCJ 
r Surface of Human Diaphragm. 
, esophagus ; fCI, infcrinr vena cava ; TftD, thoracic duct ; 
.40, uort.i. 
diaphragmatitis (di-a-frag-ma-ti'tis),n. [NL., 
< LL. diaphragnia(t-), diaphragm, + -itin.] In 
p<itln>l.. inflammation of the diaphragm or of 
its serous coats. Also diaphragmitis. 
diaphragmatocele (di'a-frag-mat'o-sel), . [< 
Gr. did0/xzj/tti(T-), diaphragm, + Kiflji, tumor.] In 
pathol., hernia, or a tumor, from a part of the 
viscera escaping through the diaphragm. 
diaphragmodynia (d!-a-frag-m6-din'i-8,), . 
[NL., < Gr. iidfymyfia, diaphragm, -r- bdivi/, pain.] 
Pain in the diaphragm. 
diaphyses, n. Plural of diaphysis. 
diaphysial (di-a-fiz'i-al), a. [< diaphysis + -al] 
Pertaining to a diaphysis ; extending continu- 
ously between two ends, as the shaft of a bone. 
diaphysis (di-af'i-sis), n. ; pi. diaphyses (-sez). 
[NL., < Gr. iiativaif, a growing through, burst- 
ing of the bud, < iou/n'coDai, grow through, of 
buds, < Aid, through, + QvcoQai, grow: see phy- 
sic, etc.] 1. In /o/., an abnormal elongation 
of the axis of a flower or of an inflorescence ; a 
form of prolification. 2. In anat., the conti- 
nuity of a bone between its two ends; the shaft 
of a long bone, as distinguished from its epi- 
physes or apophyses. 
diaplasis (di-ap'la-sis), n. [NL., < Gr. iid^aaif, 
a putting into shape, setting of a limb (Galen), 
< SiaTT>.aaaew, form, mold, set a limb, < did, 
through, + vlAaoeiv, form, mold.] In surg., re- 
duction, as of a dislocation or fracture. Dun- 
glison. 
diaplastic (di-a-plas'tik), a. and n. [< Gr. "did- 
Tr/eioTof, verbal adj. of ounrhdaaciv, fonu (see 
diaplasis), + -ic.] L a. Of or pertaining to 
diaplasis: as, a diaplanlic medicine or embro- 
cation. 
H. a. A medicine used in the treatment of 
fractured or dislocated limbs. 
diaplex (di'a-pleks), n. Same as diaplextis. 
diaplexal (di-a-plek'sal), a. [< diaplex + -J.] 
IN ! taiiiing to the diaplexus. 
diaplexus (di-a-plek'sus), . [NL., < Gr. Sia, 
throuirli. -f 1,. pltsiix: seo /i^'nw.] The choroid 
plexus of the diacoelia or third ventricle of the 
brain. Also diaplex. 
outgrowth: see apopliysis.] The transverse pro- 
cess proper of a vertebra; the lateral process 
from each side of the neural arch, paired with 
its fellow of the opposite side of the same ver- 
tebra. It Is one of the most constant and characteristic 
of the several vertebral apophyses. When there are more 
than one pair of transverse processes, the diapophysfs is 
the dorsad or neurad one, as distinguished from a para- 
pophysis or pleurapophysis. In cervical vertebra} the dia- 
]>ophyses are commonly confluent with pleurapophyses, 
forming a compound transverse process, pierced by the 
vertehrarterial foramen, the posterior tuttcrcular Wing 
the proper diapophysiai portion of such formations. Hee 
cuts under alia*, cervical, and dorsal. 
diaporesis (di'a-po-re'sis), . [LL., < Gr. tia- 
iropT/aif, a doubting, a rhetorical figure so called, 
< iiaxopeiv, doubt, be at a loss, < did, through, 
apart, + diropetv, be at a loss: see aporia] In 
rhct., a figure by which the speaker professes 
to be in doubt which of several statements to 
make, which of several courses to pursue or rec- 
ommend, where to begin or end, or, in general, 
what to say on a topic: as, What shall I do 
remain silent or speak freely T Shall I call this 
folly, or shall I call it crime T If a judge, the 
audience, or an opponent is asked to settle the 
doubt, the figure is called anactenosis. 
Diapria (di-ap'ri-a), . [NL. (Latreille).] The 
typical genus of jbiapriino!. 
Diapriinae (di-ap-ri-i'ne), n. pi. [NL., < Dia- 
pria + -ina;.] A subfamily of parasitic hyme- 
nopterous insects, of the family J'roctotrypidff. 
They have entire hind wings, 1-spurred fore tibia 1 , anten- 
nae inserted alx>ve the mouth, and the broad hind wings 
with no middle vein. The subfamily was established by 
Haliday in 1 - lo. 
diapryt, [< F. diapre, diapered, pp. of dia- 
prer, diaper, adorn with diaper-work : see dia- 
per, v.] Adorned with diaper-work ; varie- 
gated. 
The Diapry Mansions, where man-kindc doth trade, 
Were built in Six Dales: and the Seav'nthwas made 
Tin- sacred Sabbath. 
Sylvtiter, tr. of Un Itartas's Weeks, ii., The Handy-Crafts. 
diapyesis (di'a-pi-e'sis), . [NL., < Gr. Sta- 
;rii r ;<Hf, suppuration, < diaxveiv, suppurate : see 
diapyetic.] Suppuration. Dunglixon. 
diapyetic (dl'a-pi-et'ik), n. and . [< Gr. tia- 
rrftfrdiof, promoting suppuration, < dicnrvtiv, 
suppurate, < did, through, + n'mv, pus.] I. 
a. In med., producing suppuration; suppura- 
tive. 
II. n. A medicine which produces suppura- 
tion ; a suppurative. 
diapyle (dra-pil), n. [< Gr. did, through, + 
~'-'->l, gate, entrance.] A term applied by 
Miers to a perforation through the testa at the 
end of a seed, for the passage of the raphe. 
diarchy (di'ar-ki), n. ; pi. diarchies (-kiz). [< 
Gr. as if 'AiapxM, < 'diapxof, only in pi. ai- 
apxoi, lit. two rulers, < it-, two-, + apxeiv, rule.] 
A government in which the executive power 
is vested in two persons, as that of the two joint 
kings of Sparta or of Siam, or as in the case of 
William and Mary of England. Also, errone- 
ously, dinarcliy. 
diarhodont (di-ar'o-don), . [ML. 'diarhodon, 
"tlinrrhodon, also diarhodinus, < Gr. didppodof, 
compounded of roses, < did, between, + pAAav, a 
rose.] A color mentioned in medieval descrip- 
tions of stuffs: probably, from its derivation. 
a brilliant red. 
diarial (di-a'ri-al), a. [< LL. diarivm, a diary, 
+ -al.] Same as diaruin. 
diarian (di-a'ri-an), a. [< LL. diariiim, a diary, 
+ -'/.] Pertaining to a diary or journal ; jour- 
nulistie. 
