PRI- 
ee oe n; physis, growth.) <A 
s on the anterior face of the 
Saat a 
iculation with 
F). 
through asperinad tissue ). 
prickle cells,—cells of the deeper 
ayers of tified squamous 
epithelium: they a 
fine, marginal, connecting fibrils 
anat.). 
primary (primari) @. [L. primus, 
first.] First; pr rincipal ; original ; 
appl. i feathers, meristem, root, 
wood (4z0. 
primaxil (primak’sil) n. [L. primus, 
first; axilla it.] The first 
axillary arm of a Crinoid (zoo/.). 
prachs (pri‘mibraks) #. p/w. [L 
primus, firs rachia, ee 
re cs ac. arms 
Crinoids, all brachi als up to and 
including the first axillary (zoo/.). 
ri min rimus, 
primitive (prim‘itiv) a. [L. primitivus, 
ii pees ih ; appl. 
aorta, palate, 
LL. prim- 
mitive ; 
appl. 
pe ove, knot, s 
ventricle (em 
ordial (pri ae dial) a. 
primordi nm [L 
primordium, a beginning. So 
form; a structure when first in- 
dicating assumption ; 
anlage (é 
priodont (pri ‘édont) a. ([Gk. prio 
aw ; pean: ooth.] Saw- secret 
tag- eetien with smallest 
f mandible projec- 
Sitecoatia prim ik) a. [L. phe. 
prism.] Like a prism ; appl. \e 
(Got.) consisting © of prisms, as ths 
prismatic layer of shells (zo0/.). 
255 
PRO- 
proamnion (proam’nién) 2. oF ron 
pro, before ; amnion, a vessel for 
higher vertebrates 
proangiosperm — jidspérm) 7. 
anggeion, vessel ; 
fos f 
sperma, sao A fossil type 0 
boscis- ape bn ool.). 
elem “TGk. proboskis, 
periphery of the aS a6 te) 
vascular bundle; a desmogen 
e 
vascular bundles are anvelegea 
ot.). 
procarp (pro’karp) #. [Gk. fre, for ; 
soft Virait.} The female nist 
red Seaweeds, a one or 
veiled structure containing no differ. 
entiated oosphere (407). 
process (pro’sés) 7. [L. fro, forth ; 
cedere, to go.] An outgrowth, pro- 
longation, se eciagpgeag or eminence 
of an 
processus,—a oes ss. 
prochorion (prokd’rién) #. [Gk. 
ing structure 
vesicle preceding formation of a 
chorion Smeg 
prochromatin (prokré’matin) 7. [Gk. 
pro, for ; eb: co ‘i Plasmo- 
some subst c 
procoelous (pro Sse ‘his a [Gk. pro, 
before ; 4oz/os, hollow. 4 With con- 
cave anteri or face, as vertebral 
— (zoo 
i.). 
oracoid (prokérakoid) ”. [Gk. 
ark before ; 4orax, crow.] An 
