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the ovum are predestined to develop 

 into certain organs or parts (dial.). 



premaxilla (pre'maksil'a) n. [L. 

 prize, before ; maxilla, jaw.] A 

 paired bone anterior to the maxilla 

 in most vertebrates (zool.). 



premaxillary (pre'maksil'ari) a. [L. 

 prae, before ; maxilla, jaw.] An- 

 terior to the maxillae ; pert, the 

 premaxilla (zoo/.). 



premedian (preme'dlan) a. [L. prae, 

 before ; medius, middle.] Anterior 

 to the middle of a body or part ; 

 appl. a vein in front of the median 

 vein of certain insect wings (zoo!.). 



premolar (premo'lar) a. [L. prae, 

 before ; mola, mill.] Appl. the 

 teeth developed between canines 

 and molars, the bicuspid teeth 

 (zoo!.). 



prenasal (prena'zal) a. [L. prae, 

 before ; nasus, nose.] A bone 

 developed in the septum in front 

 of the mesethmoid in certain 

 Mammals (zoo/.). 



preocular (preSk'iilar) a. [L. prae, 

 before ; oculus, eye.] In front of 

 the eye ; as antennae, scales (zool.). 



preopercle, preoperculum. 



preoperculum (pre'oper'kulum) n. 

 [L. prae, before ; operculum, cover.] 

 The anterior membrane bone of 

 the operculum or gill-cover (zool.). 



preoral (preo'ral) a. [L.prae, before ; 

 os, mouth.] Situated in front of 

 the mouth ; appl. cilia, etc. (zool.}. 



preorbital (preor'bital) a. [L. prae, 

 before ; orbis, circle.] Anterior to 

 the orbit ; appl. a membrane bone 

 of Teleosts (zool.}. 



prepatagium (prepata'jium) n. [L. 

 prae, before ; patagium, border.] 

 The alar membrane, or fold of 

 skin extending between upper arm 

 and forearm of Birds (zool.). 



preplacental (pre'plasgn'tal) a. [L. 

 prae, before ; placenta, a flat cake.] 

 Occurring before placenta forma- 

 tion or development (emb.). 



prepollex (prepol'gks) n. [L. prae, 

 before ; pollex, thumb.] A rudi- 

 mentary additional digit occurring 

 sometimes preaxially to the thumb 

 digit of certain Amphibians and 

 Mammals (zool.}. 



prepotency (prepo'tgnst) n. [L. prae, 

 before ; potens, powerful.] The 



fertilization of a flower by pollen 

 from another flower in preference 

 to pollen from its own stamens, 

 when both are offered simultane- 

 ously (dot.) ; capacity of one parent 

 to transmit more characteristics to 

 the offspring than the other parent 

 (blol.). 



prepotent (prepo'tent) a. [L. prae, 

 before ; potens, powerful.] Trans- 

 mitting the majority of character- 

 istics (&#/.) ; appl. a flower exhibiting 

 a preference for cross-pollination 

 (bot.). 



prepubis (prepu'bis) n. [L. prae, 

 before ; pubes, mature.] Part of 

 the pelvic girdle of certain Reptiles, 

 anterior to the pubis (zool.). 



prepyramidal (pre'piram'idal) a. [L. 

 prae, before ; pyramis, pyramid.] 

 In front of the pyramid ; appl. a 

 cerebellar fissure (anat.). 



presphenoid (presfe'noid) n. [L. 

 prae, before ; Gk. sphen, wedge.] 

 In many vertebrates, a cranial bone 

 anterior to the basisphenoid (zool.). 



pressor (prgs'or) a. [L. pressare, to 

 press.] Appl. nerve-fibres which, 

 when stimulated, cause a rise of 

 arterial pressure (phys.). 



pressure (presh'iir) n. [L. pressare, 

 to press.] Tension in plant tissue 

 caused by the turgidity of the cells 

 (dot.). 



presternal (prester'nal) a. [L. prae, 

 before ; sternum, breast - bone.] 

 Situated in front of the sternum or 

 breast-bone ; pert, the anterior part 

 of the sternum (zool.). 



presternum (prester'num) n. [L. 

 prae, before ; sternum, breast-bone.] 

 The manubrium, or anterior part of 

 a sternum (zool.). 



pretrematic (pre'tremat'ik) a. [L. 

 prae, before ; Gk. trema, hole.] 

 Appl. nerves running in the anterior 

 wall of the first gill cleft to the 

 pharynx (zool.}. 



prevertebral (preveYtgbral) a. [L. 

 prae, before ; -vertebra, a vertebra.] 

 Pert, or situated in the region in 

 front of the vertebral column ; appl. 

 a portion of the base of the skull 

 (emb.) \ appl. ganglia of the sympa- 

 thetic system (zool.). 



prezygapophysis (prezl'gapofiisTs) n. 

 [L. prae, before ; Gk. zygon, yoke ; 



