HYD- 138 HYD- 
hydathode oie ae [Gk. hydor, hydrome —— n. ([Gk. hydor, 
water ; odos, An epidermal ter ; , full.) ~~ tissue 
structure specialized for the secre- that conducts eee (bo 
tion of wa ——— mm (hi deéunée’Athérm) 
hydatid (h’datia) in. [Gk. ydatis, n. Gk. Hone water; mega, 
vesicle.] Any vesiele or great ; noes heat.] A plant 
sac filled with a clear weer -like so t have both moisture 
fluid, and containing encyste d 
stages of the larval tapeworms 
a ). 
hydatiform (hidat bain a. [Gk 
hydats Fes vesicle ; L. forma, 
pe. ] — a hydatid 
[Gk 
pas 
hydatigenous (hi'datij’Entis) a. 
hydatis, watery vesicle ; gignest, 
to ower roducing or ‘antag 
ds (zool.). 
th (hidrnth) nm. (Gk. go 
aa anthos, flower.] A nu 
tive zooid in . pier a 
(zool.). 
—— (hi‘drékélis) 2. [Gk 
ondary branches o 
[Gk. hydor, 
water ; £oz/os, hollow a The water- 
vascular system in the Echino- 
(z00/.). 
drocyst (hidrésist) #. [Gk. hydor, 
water ; Byitis, bladder.] A dactylo- 
zooid (zool. ). 
ydroecium (hidré’shi see - [Gk 
hydor, water; otko use. | A 
closed sabe at the ssn ae of a 
Siphonophore ; an infundibulum 
Zool, 
hydroid (hi’droid) = a. [Gk. hydor, 
ater; ezdos, resemblance. A 
Ww 
tracheid (do4.) ; peers or similar to 
genus hy dra ; the polyp form 
ofa taarelonds n (zo l.). 
hydrolysis (hidrdl'isis) ~. [Gk. hydor, 
water; dyein, to dissolve.] De- 
sitiacainton of a chemical com- 
pound by the addition of water 
prey 
at oa develop fully Sarre 
euisephdious (hidréfiiliis) a. 
hydor, water; philein, to lov - 
Pollinated through the agency of 
er (07). 
hydrophyllium (hi'dréfil’itim) 2. [Gk. 
hydor, water ; phyllon, \eaf.] One 
of leaf-like transparent bodies 
arising above and partly covering 
the sporosacs in a Siphonophore 
zool.). 
sane spalr (hi'dréfit) #7 [Gk. hydor, 
ater ; Dhyfon, plant.] An aquatic 
plant 
phyton ee) m  [Gk. 
ppt water; phyfon, plant.] A 
complete hydroid fa root- 
ike organ, stem and _ branches 
(zool.). 
— OT ee m. [Gk. 
hydor, w L. planus, flat.| A 
Coelenterate — a planula and 
an actinula 
hydropolyp didropa ip) # [Gk 
hydor, F. polype, polyp.] 
A polyp of. a " hydroid colony; a 
hydrula (zoo/.). 
hydropore (hi’drépér) x. 
[Gk. hydor, 
water ; foros, opening. ] 
of a hydroid colony (zool.). 
hydrosome (hi dris rl 8 np Aer 
4 = y.] The con 
alike stage in a 
coelenterate life-history (zool.). 
hydrospire (hi'dréspir) #. [Gk. Aydor, 
water; L. sfira, coil.] The folds 
on the stereom os la gc re- 
spiratory structure 
ydrost; peipncet a n. 
hydor, water ; stoma, mouth.] T 
mouth of a hydroid polyp ee ie 
bygeeacte (hi'drétak’sis) 7 
hydor, water ; taxis, a 
The response of certain small 
