Dipodomys 
E. mouse.] The typical and only genus of the 
subfamily Dipodomyince. D. phillipsi inhabits the 
Pacific coast region of the United States and Mexico. It 
is about four inches long, with the tail half as long again ; 
it has brown or gray upper parts and snowy under parts, 
1634 
Kangaroo-rat (Difxulomfs phillipsi). 
a white stripe along each side of the tail, and another over 
the hips. A closely related species or variety, D. ordi, in- 
habits the interior Rocky Mountain region. They are 
known as kangaroo-rats, from the shape of the body and 
limbs and their great power of leaping. 
dipody (dip'p-di), . ; pi. dipodies (-diz). [< LL. 
aipodia (Atilius Fortunatianus, Marianus Vic- 
torinus, etc.),< Gr. Smooia, a dipody, two-footed- 
ness, < &m66r/<;, two-footed, < <f-, two-, + Kolt<; 
(TTOO-) = E. /oof.] In pros., a group of two like 
feet; a double foot; especially, a pair of feet 
constituting a single measure. A dipody is marked 
as a unit by making the ictus of one of the two feet stronger 
than that of the other. In ancient prosody iambi and tro- 
chees ai'e regularly, and anapests xisually, measured by 
dipodies. Sometimes the word syzygy is used as equiva- 
lent to dipody. 
One trochaic or iambic dipody for thesis, and one for 
arsis. J. Hadley, Essays, p. 101. 
dipolar (di-po'lar),o. [< di- 2 + polar.] 1. Hav- 
ing two poles ; differentiated in respect to a 
pair of opposite directions, but not with re- 
spect to the difference between these directions : 
as, polarized light is dipolar. 
When Adipolar quantity is turned end for end it remains 
the same as before. Tensions and pressures in solid 
bodies, extensions, compressions and distortions, and most 
of the optical, electrical, and magnetic properties of crys- 
tallized bodies are dipolar quantities. 
Clerk Maxwell, Elect, and Mag., 381. 
Along the axis of a crystal of quartz there is dipolar 
symmetry ; along the lines of force in a transparent dia- 
magnetic there is dipolar asymmetry. Tait, Light, 298. 
2. Pertaining to two poles. 
Dipolia, n. pi. See Diipolia. 
diporpa (di-p6r'pa), n. ; pi. diporpce (-pe). [NL., 
< Gr. it-, two-, + Tropirr/, a buckle, clasp.] A sup- 
posed genus of trematode worms, being a stage 
in the development of members of the genus 
Diplozoon (which see), before two individuals 
are united by a kind of conjugation to form the 
double animal. 
The Diporpte, when they leave the egg, are ciliated and 
provided with two eye-spots, with a small ventral sucker 
and a dorsal papilla. After a time the Diporpce approach, 
each applies its ventral sucker to the dorsal papilla of the 
other, and the coadapted parts of their bodies coalesce. 
Huxley, Anat. Invert., p. 182. 
Dippel's oil. See oil. 
dipper (dip'er), n. [< ME. dippere (only as the 
name for a water-bird: see def s. 5 and 6, and cf. 
didapper); < dip + -eri.] 1. One who or that 
which dips. Specifically 2. [cop.] [Cf. dop- 
per.~] Same as Dunker 1 . 3. In paper-manuf. , 
the workman who mixes the pulp and puts it 
upon the mold. 4. One who dips snuff. See 
to dip snuff, under dip, v. t. [Southern U. S.] 
The fair dipper holds in her lap a bottle containing the 
most pungent Scotch snuff, and in her mouth a short stick 
of soft wood, the end of which is chewed into a sort of 
brush. This is ever and anon taken out, thrust into the 
bottle, and returned to the mouth loaded, as a bee's leg is 
with pollen, with the yellow powder. 
W. M. Baker, New Timothy, p. 75. 
5. A bird of the genus Cinclus or family Cincli- 
dte : so called because it dips, ducks, or dives un- 
der water. The common European dipper, also called 
water-ouzel and by many other names, is C. aquations, a 
small dark-colored bird with a white breast, of aquatic 
habits, inhabiting streams, and walking or flying under 
water with ease. The American dipper is a similar but 
distinct species, C. mexicanus, entirely dark-colored when 
adult. There are in all about 12 species of dippers, mostly 
inhabiting clear mountain-streams of various parts of the 
world. They belong to the turdiforra group of oscine 
Passeres, in the vicinity of the thrushes, and are notable 
as the only thoroughly aquatic passerine birds. See cut 
in next column, and also cut under Cinclidce. 
Hence 6. Any swimming bird which dives 
with great ease and rapidity, as a grebe, dab- 
chick, or didapper; especially, in the United 
European Dipper ( Cinctuj afttaticus). 
States, the buffle, BucepJiala albeola, which is 
also called spirit-duck for the same reason. See 
cut under buffle. 7. A vessel of wood, iron, or 
tin, with a handle usually long and straight, 
used to dip water or other liquid. 8. [cop.] 
The popular name in the United States of the 
seven principal stars in Ursa Major, or the 
Great Bear: so called from their being ar- 
ranged in the form of the vessel called a dip- 
per. The corresponding stars in Ursa Minor 
are called the Little Dipper. See cuts under 
Ursa. 9. In plwtog., a holder or lifter for 
plunging plates into a sensitizing or fixing 
bath ; especially, such a holder used in the wet- 
plate process for plunging the collodionized 
plate into the sensitizing bath of nitrate of 
silver. 10. A simple form of scoop-dredge. 
See dredging-machine. 
dipper-clam (dip'er-klam), n. A bivalve of 
the family Mactridce, Mactra solidissima, in- 
habiting the eastern coast of the United States. 
It attains a large size, is of a subtriangular form, and its 
valves are sometimes used as dippers or suggest such use, 
whence the name. 
dipperful (dip'6r-ful), n. [< dipper + -ful, 2.] 
As much as a dipper will contain. 
All hands continually dip up at random gauze dipper- 
fuls of water. The Century, XXVI. 732. 
dipping (dip'ing), n. [Verbal n. of dip, v.~\ 1. 
The act of plunging or immersing. 
That which is dyed with many dippings is In grain, and 
can very hardly be washed out. 
Jer. Taylor, Repentance, v. 4. 
Specifically 2. Baptism by immersion. 3. 
The process of brightening ornamental brass- 
work, usually by first "pickling" it in dilute 
nitric acid, next scouring it with sand and 
water, and afterward plunging it for an instant 
only in a bath consisting of pure nitric acid. 
4. A composition of boiled oil and grease, used 
in Scotland by curriers for softening leather 
and making it more fit for resisting dampness: 
in England called dubbing. 5. The washing 
of sheep to cleanse the fleece before shearing. 
6. In ceram., the process of coating a coarse 
clay body with enamel or slip of a fine quality 
by plunging the vessel into the liquid material 
for the coating, or of covering stoneware with 
a glaze. Each piece is generally dipped by hand, and 
a skilful workman is able to give a uniform coating of the 
covering material to the whole piece at a single plunge. 
As soon as dipped, the piece is taken to the drying-house 
or hothouse. 
7. A mode of taking snuff by rubbing it on the 
teeth and gums. See to dip snuff, under dip, 
v. t. [Southern U. S.] 
dipping-compass (dip'ing-kum"pas), n. An in- 
strument eonsistinges- 
sentially of a dipping- 
needle (which see), a 
vertical graduated cir- 
cle whose center co- 
incides with the axis 
of the needle, and a 
graduated horizontal 
circle, the whole being 
supported upon a tri- 
pod stand; an incli- 
nometer. It is used to 
measure the angle of dip 
or inclination of the mag- 
netic needle. 
dipping-frame (dip'- 
ing-fram), n. 1. A 
frame which holds the 
wicks to be dipped in 
the hot tallow-bath for 
making candles. 2, Dip P m g , m pass. 
Dipsacaceae 
A frame on which a fabric is stretched while 
being dipped in a dye-bath. 
dipping-house (dip'ing-hous), n. In ceram., 
the building in which the biscuit is dipped into 
the glaze or enamel. See dipping, 6. 
dipping-liquor (dip'ing-lik"gr), n. Dilute sul- 
phuric or nitric acid, used by founders and 
others to clean the surface of metal. See pickle. 
dipping-needle (dip'ing-ne''dl), n. An instru- 
inentfor showing the direction of the earth's 
magnetism. Its axis is at right angles to its length, 
and passes as exactly as possible through the center of 
gravity, about which it moves in a vertical plane. When 
a needle thus mounted is placed anywhere not in the 
magnetic equator, it dips or points downward; and if 
the vertical plane in which it moves coincides witli the 
magnetic meridian, the position which it assumes shows 
at once the direction of the magnetic force. See cut under 
dipping-compass. 
dipping-pan (dip'ing-pan), n. A cast-iron tray 
or flask in which stereo-casts are made. 
dipping-tube (dip'ing-tub), n. Same &ajislring- 
tube. 
dipping-vat (dip'ing-vat), n. The tank con- 
taining the slip or glazing-film in which pot- 
tery is dipped to give it a fine surface. 
dipping-wheel (dip'ing-hwel), n. A contri- 
vance for catching fish, consisting of a wheel 
placed in a narrow race or fishway in a stream, 
and acting as a current-wheel. The blades of the 
wheel are formed of nets, in which flsh ascending the 
stream are caught, and from which they are thrown out 
upon the bank by the revolution of the wheel. 
dip-pipe (dip'pip), n. A valve in a gas-main 
arranged so as to dip into water or tar, and thus 
form a seal ; a seal-pipe. 
dip-regulator (dip'reg"u-la-tor), n. In gas- 
worts, a device for regulating the seal of the 
dip-pipes in the hydraulic main, and for draw- 
ing off the heavy tar from the bottom of the 
main without disturbing the seal. IS. B. 
Knight. 
diprionidian (di-pri-o-nid'i-an), a. [< Gr. Si-, 
two-, + npiuv, a saw '(also a'sawyer. prop. ppr. 
of irpieiv, saw), + -id-tan.] An epithet applied 
to certain fossil hydrozoans the polypary of 
which has a row of cellules on each side : op- 
posed to monoprionidian. Such hydrozoans are 
chiefly confined to the Lower Silurian and Cam- 
bria^ formations. 
diprismatic (dl-priz-mat'ik) ; a. [< di- 2 + pris- 
matic."] 1. Doubly prismatic. 2. In crystal., 
having cleavages parallel to the sides of a four- 
sided vertical prism, and at the same time to a 
horizontal prism. 
dip-rod (dip'rod), n. A rod on which candle- 
wicks are hung to be dipped into melted tallow. 
dip-roller (dip'rpler), . In a printing-press, 
a roller which dips ink out of the fountain. 
diprosopns (di- pro -so 'pus), n. [NL., < Gr. 
divpoaumof, two-faced, < at-, two-, T irpoaanov, 
face.] In teratol., duplication of the face, in 
any of its grades, from simple duplication of 
the mouth-cavity to complete development of 
two entirely separate faces. 
Diprotodon (dl -pro 'to -don), n. [NL., < Gr. 
01-, two-, + vpiJTOf, first, + Muv, Ionic form of 
odoi'C (odWr-) = E. tooth.} 1 . A genus of extinct 
marsupial quadrupeds, surpassing the rhino- 
ceros in size. They had 3 incisors on each side of the 
upper and 1 on each side of the lower jaw ; no canines ; 1 
premolar and 4 molars on each side of each jaw ; the median 
upper incisors large and scalpriform ; the molars trans- 
versely ridged, as in the kangaroo, but without the longi- 
tudinal connecting ridge ; and the hind limbs less dispro- 
portionately enlarged. The dentition of this genus gives 
name to the diprotodont pattern of primitive herbivorous 
marsupials. D. australis is a species found in the Post- 
tertiary of Australia. 
2. [I. c.] An animal of this genus. 
Diprotodon, an animal holding the same place amongst 
the Australian mammals that the pachyderms do amongst 
the fauna of other continents. Science, VI. 321. 
diprotodont (dl-pro'to-dont), a. and n. [< ZW- 
protodon(t-).] I. a. 'Having two lower front 
teeth; noting the herbivorous type of denti- 
tion in marsupial mammals, in which the me- 
dian incisors are prominent, and the lateral 
incisors and canines small or wanting ; specifi- 
cally, having the characters of the genus Dipro- 
todon: opposed to polyprotodont. 
II. n. An animal of the genus Diprotodon; a 
marsupial with diprotodont dentition. 
Diprotodontia (di-pro-to-don'shi-a), n. pi 
[NL., < Diprotodon(t-) +' -jo 2 .] A group of 
marsupials characterized by the diprotodont 
dentition. 
Dipsacaceae (dip-sa-ka'se-e), n.pl. [NL., some- 
times improp. Dipsacca; < Dipsarus + -acea.] 
A natural order of pamopetalous dicotyledonous 
plants, with opposite leaves and the small flow- 
