PAT- 



229 



PEC- 



a border.] The membranous ex- 

 pansion between fore and hind 

 limbs of bats and flying squirrels 

 and foxes ; the similar expansion 

 on a bird's wing ; a tegula, or 

 dorsal process of the prothorax of 

 certain Lepidoptera (zool.}. 



patella (pateTa) n. [L. patella, a 

 small pan.] The knee-cap (zool.} ; 

 a rounded apothecium of Lichens 

 (bot.\ 



patellar (patel'ar) a. [L. patella, a 

 small pan.] Pert, a patella. 



patelliform (patel'iform) a. {L.patella, 

 a small pan ; forma, shape.] Shaped 

 like a patella ; pan-shaped ; like a 

 bordered disc. 



patent (pat'fint) a. [L. patens, lying 

 open.] Spreading widely ; ex- 

 panded (biol.}. 



pathetic (pathet'ik) a. [Gk. pathos, 

 feeling.] Appl. the trochlear nerve 

 and the superior oblique muscle of 

 the eye (anat.}. 



pathogenic (path'ojSn'ik) a. [Gk. 

 patJws, suffering ; genos, offspring.] 

 Disease-producing ; appl. a parasite 

 in relation to a particular host 

 (biol.}. 



patina (pat'ma) n. [L. patina, a 

 dish.] Circles of plates round 

 calyx of Crinoids (zool:). 



patulent (pat'ulent),' patulous ( 

 iilus) a. [L. patulus, sta 

 open.] Spreading open ; expa 

 (biol.}. 



paturon (patu'ron) n. [Gk. patein, 

 to trample on.] The basal joint of 

 arachnid chelicerae, used for crush- 

 ing and expressing the -fluids of 

 insects (zool.}. 



paulospore (pol'ospor) n. [Gk. paula, 

 rest ; sporos, seed.] A resting or 

 winter stage in development, as a 

 cyst ; a stage of suspended de- 

 velopment (biol.}. 



paunch (ponsh) n. [L. pantex, the 

 paunch.] The rumen, an expansion 

 of the oesophagus, the first stomach 

 of ruminants (zool.}. 



pavement epithelium, simple 

 squamous epithelium of flat, nucle- 

 ated scales, fitting together like 

 mosaic (phys.}. 



paxilla (paksll'a) n. [L. paxi/lits, a 

 peg.] A thick plate supporting 

 calcareous pillars, the summit of 



each covered by a group of small 

 spines, a structure of certain 

 Stelleroids (zool.}. 



paxillar (paksll'ar) a. [L. paxillus, 

 a peg.] Pert, a paxilla. 



paxilliform (paksll'iform) a. [L. 

 paxillus, a peg ; forma, shape.] 

 Shaped like a paxilla. 



paxillus, a paxilla. 



pearl (pgrl) n. [F. perle, a pearl.] 

 In the shells of some Mussels, an 

 abnormal growth formed with a 

 grain of foreign matter or a minute 

 organism for nucleus and many thin 

 layers of nacre surrounding it (zool.}. 



pectase (pek'las) n. \Gk.pektos, con- 

 gealed.] An enzyme of plants 

 which forms vegetable jelly. 



pecten (pgk'tgn) n. [L. pecten, a 

 comb.] Any comb-like structure ; 

 a process of the inner retinal 

 surface in Reptiles, expanded into 

 a folded quadrangular plate in 

 Birds ; the stridulating organ of 

 certain Arachnids (zool.}. 



pectic (pek'tik) a. [Gk. pektos, con- 

 gealed.] Appl. acids and bodies 

 consislw^ of pectase, pectin, 



a. [L. pecten, 

 a pecten. 



(pgk'tinat) a. [L. pecten, 

 .] Comb-like ; pectiniform ; 

 appl. leaves (bot.}, a ligament of the 

 iris (anat.}, certain gills, pedi- 

 cellariae of Asteroids, a septum 

 between the corpora cavernosa 



pectlneal (pgkttn'eal) a. [L. pecten, 

 comb.] Afpl. a process of the 

 pubis of Birds ; appl. a ridge-line 

 on the femur and the muscle 

 attached thereto (anat.}. 



pectinellae (pek'tlnele) n. plu. [L. 

 pectinella, a small comb.] Trans- 

 versely-planted, comb-like mem- 

 branellae constituting the adoral 

 ciliary spiral of some Infusoria 

 (zool.}. 



pectinirhomb (pSk'tlnlromb') n. [L. 

 pecten, comb ; Gk. rhombos, a magic 

 wheel.] A type of stereom-folding 

 in Cystidea (zool.}. 



pectoral (peYtoral) a. [L. pectus, 

 breast.] Pert, the chest ; in the 

 chest region ; appl. arch, girdle, 

 fins, limbs (zool.}. 



