Anterior face of a dorsal vertebra of the 
python, showing zs, zygosphene ; pz, pre- 
zygapophysis ; //.transverse process; us, 
neural spine ; fir, neural canal ; c, cen- 
trum of the procoilian vertebra, whose con- 
cavity fits the convexity of the centrum 
shown under zyg-afi/rttM. 
zygosphene 
of the vertebrse of serpents and some lizards, 
which fits into a corresponding fossa, the zy- 
gantrum, on the 
posterior part of «*■ 
the neui-al arch 
of a preceding 
vertebra. and 
serves thus to 
interlock the se- 
ries of arches 
more effectually 
than would be 
done by zyga- 
pophyses alone. 
Compare cut un- 
der sygantrum. 
zygosporangium 
(zi'go-spo-ran'- 
ji-um), H.; pi. -■//- 
gosporangia (-a). 
iNL.,<Gr. Cujov, 
yoke, + CKopa, 
seed, + ayyclov, 
vessel.] In hot., a sporangium in which zygo- 
spores are produced. 
zygospore (zi'go-spor), n. [NL., < Gr. i^vyov. 
yoke, + oKopd, seed.] In hot., a spore formed 
in the process of reproduction in some algee and 
fungi by the union or conjugation of two simi- 
lar gametes or protoplasmic masses: called iso- 
fipore by Rostafinski. Also ::i/gosperm, zygote. 
See spore^, conjugation, 4 (with cut). 
Zygosporeae (zi-go-spo'rf-e), «. pi. [NL., < 
Gr. (,vy6v, yoke, -i- CTVopd, seed, + -eas.] In 
Sachs's system of classification, a group of 
plants characterized by the production of zy- 
gospores. It is no longer maintained. 
zygosporophore (zi-go-spor'o-for), u. [NL., < 
Gr. s ">'''', yoke, -I- a-opa, seed, + (plpetv = E. 
beaA.^ In hot., a club-shaped or conical sec- 
tion of a hypha adjoining a gamete-cell after its 
delimitation. De Barij. 
zygote (zi'got), n. [< Gr. Cv)u-6i;, yoked, < Ct'- 
)otT, yoke: see zygoma.'] Same as ::ygospore. 
Zygotrocha (zi-got'ro-kii), ii. pi. [NL., < Gr. 
^vyov, yoke, + vpoxoi:, wheel.] In Ehrenberg's 
classification, a division of rotifers: correlated 
with Schizotrocha. 
zygotrochous (zi-got'ro-kus), a. Of or per- 
taining to the Zygotrocita. 
zygOZOOSpore (zi-go-zo'o-spor), n. [NL., < Gr. 
C,vy6v, yoke, + Z^iov, animal, + aropd, seed.] In 
bat., a motile zygospore. 
zylo-. For words so beginning, see xylo-. 
zylonite, ". Same as xylonite. 
ZylophagUS (zi-lof'a-gus), n. The original (in- 
correct) form of Xylopihagtis. Latreille, 1809. 
zymase (zi'mas), «. [< Gr. CWi leaven, -f -(t.sc 
(after diasta.se).] Same as enzym. 
7046 
zyme (zim), n. [< Gr. t^v/nj, leaven, < Ceeiv, boil: 
see yeast.'] 1. A ferment. 
A yeast and a ferment signify the same thing, and, as a 
zyme also means a ferment, the term zymotic has arisen 
to express a certain class of diseases. 
Nineteentli Century, XXIV. 843. 
2. The living germ or other poison, of whatever 
nature, which is believed to be the specific cause 
of a zymotic disease. 
Zymic (zim'ik), a. [Also improperly zumie; < 
zyme + -ic] Pertaining to or of the nature of 
leaven: applied by Pasteur to the microbes 
which act as ferments only when the air is 
excluded, as distinguished from those which 
require the presence of air. 
zymogen (zi'mo-jen), n. [< Gr. (v/^v, leaven, 
+ -yevf/c, producing.] A substance from which 
an enzym may be formed by internal change. 
Also zymogcHC. 
A ferment is found to exist as a zy}nogen in the resting 
seed, which is readily developed by warmth and weak 
auids into an active condition. Nature, XLI. 380. 
zymogenic (zi-mo-jen'ik), «. [As zymogen + 
-ic] Exciting fermentation: as, zymogenic or- 
ganisms. 
zymogenous (zi-moj'e-nus), a. [As zymogen + 
-oils.] Same as zymogenic. 
Zymoid (zi'moid), a. [< Gr. *!^vm)si6rig, l^vpudr/^, 
like leaven, < i^vfit/, leaven, -f door, form.] Re- 
sembling a zyme or ferment. 
zymologic (zi-mo-loj'ik), a. [<. zymolog-y +-ic.] 
Of or pertaining to zymology. Also zumologic. 
zymological (zi-mo-loj'i-kal), a. [< zymologic 
+ -uL] Same as zymologic. 
zymologist (zi-mol'o-jist), n. [< zymolog-y + 
-ist.] One who is skilled in zymology. Also 
ziimologist, 
zymology (zi-mol'o-ji), n. [Also zumology ; < 
Gr. ivfi!/, leaven, -f -'Aoyia, < /.iyeiv, speak: see 
-ology.] The science of or knowledge concern- 
ing fermentation. 
Zymolysis (zi-mol'i-sis), n. [< Gr. (i-fiv, leaven, 
-I- '/i'dic, dissolving.] Same as zymosis, 1. 
zymolytic (zi-mo-lit'ik), n. [< zymolysis {-lyt-) 
+ -ic] Same as zymotic. 
Prof. Salkowski . . . concluded from his researches 
that fermentative {zymolytic) processes are continually 
taking place in living tissues. yature, XLI. 599. 
zymome (zi'mom), n. [< Gr. C,vjiufia, a fer- 
mented uii.xtm'e, < i^vprnvv, leaven, ferment, < 
ii'ii'l, leaven: see zyme.] An old name for the 
gluten of wheat that is insoluble in alcohol. 
Also ziinomc. 
zymometer (zi-mom'e-t6r), «. [< Gr. Ciiw, 
leaven, + pirpov, measure.] An insti-ument 
for ascertaining the degree of fermentation of 
a fermenting liquor. Also zymosimeter. 
zymophjrfce (zi'mo-fit), n. [< Gr. (ijft?!, leaven, 
-f (f>vT6v, plant.] A Isaeterioid ferment that 
Zjrxomma 
liberates fatty acids from neutral fats. Bil- 
zymoscope (zi'mo-skoj)), n. [< Gr. Zvp-n, leaven. 
-f- oKoirnv, view.] An instrument, contrived by 
Zenneek, for testing the fermenting power of 
yeast, by bringing it in contact with sugar- 
water and observing the quantity of carbonic 
anhydrid evolved. Watts. 
zymosimeter (zi-mo-sim'e-tfer), n, [< Gr. fi- 
pucig, fermentation, + pirpov, measure.] Same 
as zymometer. 
zymosis (zi-mo'sis), n. [NL., < Gr. Qvpxjoii, fer- 
mentation, < ff/^ow, ferment: see zymome.] 1. 
Fermentation of any kind. Also zymolysis. — 
2. An infectious or contagious disease. 
zymotechnic (zi-mo-tek'nik), o. [< Gr. Z^/ai, 
leaven, + Tixvn, art.] Relating to the art of 
inducing and managing such fermentations as 
are useful in the arts ; pertaining to zymo- 
technics. 
Zjrmotechnical (zi-mo-tek'ni-kal), a. [< zymo- 
technic + -at.] Same as zymotechnic. 
zymotechnics (zi-mo-tek'niks), n. [PI. of zymo- 
technic (see -ics).] The art of managing fer- 
mentation. Compare zymnrgy. 
zymotic (zi-mot'ik), a. and n. [< Gr. (.vpuriKO^, 
< l^vpuaig, fermentation: see zymosis.] I. a. 
Pertaining to fermentation ; of the nature of 
fermentation. A\bo zymolytic Zymotic disease, 
any disease, such as malaria, typhoid fever, or smallpox, 
the origin and procress of which are due to the multipli- 
cation within the body of a living germ introduced from 
without.— Zymotic papilloma, framboesia. 
H. n. Same as zymotic disease. See I. 
zymotically (zi-mot'i-kal-i), adv. [< zymotic + 
-al -f -ly^.] In a zymotic manner; accoitJing 
to the manner or nature of zymotic diseases. 
zymnrgy (zi'm6r-ji), n. [< Gr. ivpri, leaven, 
+ epyov, work (cf. metallurgy, etc.).] That 
department of technological chemistry which 
treats of the scientific principles of wine-mak- 
ing, brewing, and distilling, and the prepara- 
tion of yeast and vinegar, in which processes 
fermentation plays the principal part. Watts. 
Zyrichthys, n. See Xyrichthys. Stcainson, 1839. 
zythepsaryt (zi-thep'sa-ri), n. [IiTeg. < Gr. 
fifef, beer, 4- eipew, tibil (related to Trcaactv, 
boil, cook : see peptic), + -<try.] A brewery 
or brew-house. [Rare.] 
zythum (zi'thum), Ji. [< L. zythum, < Gr. Ciflof, 
beer, applied to the beer of Egypt and also to 
that of the northern nations (Koippt).] A kind 
of beer made by the ancient Egyptians. 
Zyxomma (zik-som'a), n. [NL. (Rambur, 1842), 
prop. 'ZetiTomma, < Gr. ^eii^tg, a joining « fet>)'- 
vivai, join), + 6ppa, eye : see ommatidium.] 
A genus of Indian di'agon-flies, of the family 
LihelluUdse, having the head large, the face 
narrow, the eyes of great size, and the first 
three abdominal segments vesicular. 
