VAS- 
efferentia,—the tubes which 
from the testis to the vas 
at.). 
vasal (va'sal) a. cet vas, vessel.] 
wo 
or containing vessels adapted for 
e transmission or circulation of 
fluid (ana as 
ular ar veral scattered 
areas davchined saree endoderm 
and mesoderm of yolk-sac, the 
be <a of primitive blood- 
vessels (em 
bun arte group of special 
cells consisting of two parts, the 
xylem or 
r 
separating i cies — (bo2.). 
ular tissue, cially modified 
plant-cells, usua Si consis ae of 
either tracheal or sieve cells, for 
(vas‘iférm) a. [L. Vas, 
vessel Leh shape. ] Functioning 
tor cere embling a duct ; vascular 
vasoconstrictor (vds’ 6k6nstrik’tor) a, 
- was, vessel; constri ingere, to 
draw tight.] Causing constriction 
(phys. 
tine (vdsédén’tin) 7. L. 
Uas, “seo ; dens, tooth.] A variety 
tine 
of den ? i ted by blood- 
vessels (ana 
tor (v. iva) oe _ 
vessel ; di/atus, separ. ] ax- 
ted. 
ing or enlarg ging the venecls ( pre ). 
tive (vas'éfér’mativ),—see 
ve, 
vasohypertonie (vas dhi’pérténik),— 
see vasoconstrictor. 
vasohypotonie (vis’éhi’ péténik),—see 
Vasodilator. 
vasoinhibitory (vas dinhib'itéri),—see 
ote (vid Sen a Nt. 
move. 
[L. 
vas, Vess move J 
342 
n and the 
y of 
VEL- 
Any change in — calibre of a 
pital vessel (phy 
va or (vads’ mo ‘tdr) a fis OMe, 
2 cecrage the calibre of the blood- 
vessels, through containing both 
ati da gs vasodilator 
fibre hy s.). 
autae (vas'tiis) # [L. vastus, 
immense.] Name given to various 
divisions or parts of the ——— 
muscle of the on ae ee 
de of a blastula 
megameres collect ; 
opp. animal sole (em 
vegetation —. Fath It. 
vegetare. = - ven.] Plants con- 
sidered tae 
ae cant (wefan ies — egelare, 
enliv ppl. to stage of pure 
os 
ductive 5 ; appl. 
opp. er or oe, Sa shoots 
Get).. 
vegetative cone,—the apical point 
bot.). 
ye pole,—see vegetal pole 
mo.). 
ieaeiative reproduction, — a 
a 
formation of buds (zoo/.). 
veil (val) 7. [L. cuties a sail] The 
velum ; _the calyptra (d04.); the 
velum (zoo/.). 
veins (vanz) n. “plu. [L. vena, vein.] 
The branched vessels which — 
blood to the heart (amat.); t 
ribs or nervures of an insect ae 
the branching ribs or 
A membrane (anat.) : 8 
sheath of tracheides at the apex of 
velar (vé@'lar) a. 
Pert. oo near, or belonging to 
the ve 
velarium (véla’ritim) nm. [L. velum, 
in 
g 
a 
a tru elum in ——* 
psa a canals (zool. 
velate (velat) a. [L. velu ‘um, cover- 
ing.] Veiled ; ‘covered by a velum. 
