PRO- 



258 



PRO- 



anterior cranial bone of Teleosts 

 (zool.}. 



prosiphon (prosi'fon) n. [Gk. pro, 

 for ; siphon, tube.] A spout-like 

 prolongation of the edges of the 

 mantle - flaps of certain Molluscs 

 (zool.}. 



prosocoel (pros'osel) n. [Gk. pros, 

 near ; koilos, hollow.] A narrow 

 cavity in the epistome of Mollus- 

 coidea, the first main part of the 

 coelom (zool.}. 



prosodetic (pros'odSt'Tk) a. [Gk. 

 prosodos, advance.] Anterior to 

 the beak ; appl. certain bivalve 

 ligaments (zool.}. 



prosodus (pros'odus) n. [Gk. prosodos, 

 advance.] A delicate canalicule 

 between chamber and incurrent 

 canal in some Sponges (zool.}. 



prosoma (proso'ma) n. [Gk. pro, 

 before ; soma, body.] The anterior 

 part of the body ; a cephalothorax 

 (zool.}. 



prosopyle (pros'opil) n. [Gk. proso, 

 forward ; pyle, gate.] The aperture 

 of communication between adjacent 

 incurrent and flagellate canals in 

 some Sponges (zool.}. 



prostalia (prosta'lia) n. plu. [L. pro, 

 forth ; stare, to stand.] Projecting 

 spicules of Hexactinellids (zool.}. 



prostate (pros'tat) a. [L.pro, before ; 

 stare, to stand.] Appl, a gland 

 placed around the commencement 

 of the male urethra in the pelvic 

 cavity (anat.}. 



prostatic (prostat'Ik) a. [L. pro, 

 before ; stare, to stand.] Pert, the 

 prostate gland ; appl. duct, nerve, 

 sinus, utricle (anat.}. 



prostemmate (prdste'm'at) a. [Gk. 

 pro, before ; stemma, wreath.] 

 Appl. an ante-ocular structure or 

 organ of some Collembola, of 

 doubtful function (zool.}. 



prostemmatic, prostemmate. 



prosternum (prosteYnum) n. [L. 

 pro, before ; sternum, breast-bone.] 

 The ventral part of the prothorax 

 of Insects (zool.}. 



prosthion (pros'thion) n. [Gk. pros- 

 thios, foremost.] The alveolar 

 point ; the middle point of the 

 upper alveolar arch (anat.}. 



prostomiate (prosto'miat) a. [Gk. 

 pro, before ; stonia, mouth.] Having 



a portion of the head in front of the 

 mouth (zool.}. 



prostomium (prosto'mium) n. [Gk. 

 pro, before ; stoma, mouth.] In 

 Worms and Molluscs, the part of the 

 head anterior to the mouth (zool.}. 



prostrate (pros'trat) a. [L. prostratus, 

 thrown down.] Procumbent ; trail- 

 ing on the ground (hot.). 



protandrism (protan'drizm) n. [Gk. 

 protos, first ; andros, male.] Pro- 

 tandry ; sometimes exclusively in 

 zoological application (biol.}. 



protandrous (protan'drus) a. [Gk. 

 protos, first ; andros, male.] Ex- 

 hibiting protandry (biol.}. 



protandry (protan'dri) n. [Gk. protos, 

 first ; andros, male.] Condition of 

 hermaphrodite plants and animals 

 where the male elements mature 

 and are shed before the female 

 elements mature (biol.}. 



protegulum (proteg'ulum) n. [L. pro, 

 before ; tegulum, a covering.] The' 

 semicircular or semielliptical em- 

 bryonic shell of Brachiopods (zool.}. 



proteid (pro'teid) n. [Gk. protos, 

 first ; eidos, resemblance.] The 

 nitrogenous material of plant cells ; 

 albuminous substance ; a term 

 subject to varying restrictions in 

 different authors (phys.}. 



protein (pro'tein) n. [Gk. protos, first.] 

 Albuminous substance ; a nitro- 

 genous compound of cell proto- 

 plasm ; the sum-total of nitrogen 

 present in protoplasm ; a term of 

 variable application (phys.}. 



proteolytic (pro'teollt'lk) a. [Gk. 

 protos, first ; lysis, a loosing.] 

 Appl. ferments which change pro- 

 teins into proteoses and peptones, 

 as pepsin, trypsin (pkys.}. 



proteose (pro'teos) n. [Gk. protos, 

 first.] The first cleavage product 

 of the action of hydrolysis on a 

 protein molecule (phys.}. 



proterandric (pro'teran'drik) a. [Gk. 

 proteros, earlier ; andros, male.] 

 Appl. hermaphroditism in which 

 ovaries and testes are functional 

 at different times (biol.}. 



proterandrous, protandrous. 



proteranthous (pro'teran'thus) a. 

 \G\s..proteros,c.a.r\iei:; anthos, flower.] 

 Flowering before foliage leaves 

 appear (bot.}. 



