PER- 



235 



PER- 



peri, round ; theke, a case.] A 

 flask-shaped cavity with terminal 

 ostiole in stroma of Fungi (hot.}. 



peritoneal (peVitone'al) a. [Gk. peri, 

 round ; teinein, to stretch.] Pert. 

 the peritoneum ; appl. cavity, fossa, 

 membrane (anat.). 



peritoneum (peYitone'um) n. [Gk. 

 peri, round ; teinein, to stretch.] 

 A serous membrane partly applied 

 against the abdominal walls, partly 

 reflected over the contained viscera 

 (anat.}. 



peritreme (per'itrem) n. [Gk. peri, 

 round ; trema, a hole.] The margin 

 of a shell-opening ; the small plate 

 perforated by the spiracle-opening 

 in Insects (zoo/.). 



peritrichous (peVitrik'us) a. [Gk. 

 peri, round ; thrix, hair.] Having 

 the adoral band of cilia arranged 

 in a spiral as in Vorticella (zoo/.). 



peritrochium (peYitro'klum) n. [Gk. 

 peri, round ; trochos, a wheel.] A 

 ciliary band ; a circularly ciliated 

 larva (zoo/.). 



peritrophic (per'itrof'ik) a. [Gk.peri, 

 round ; trophe, food.] Appl. a fold 

 of membrane in the latter part of 

 the intestine of Insects (zoo/.). 



perivascular (peVivas'kular) a. [Gk. 

 peri, round ; L. vasculum, a small 

 vessel.] Surrounding the blood- 

 vessels ; appl. lymph channels 

 (anat.}. 



perivisceral (peVivIs'gral) a. [Gk. 

 peri, round ; L. viscera, bowels.] 

 Surrounding the viscera ; appl. the 

 body cavity. 



perivitelline (pgr'Tvitglfn) a. [Gk. 

 peri, round ; L. vitellus, yolk of 

 egg.] Surrounding the yolk of an 

 egg- 



permanent cartilage, cartilage 

 which remains unossified through- 

 out life ; opp. temporary (zoo/.). 



permanent teeth, the set of teeth 

 developed after the milk or decidu- 

 ous dentition ; the second set of 

 most, the third set of some, the first 

 set of other Mammals. 



permanent tissue, tissue consisting 

 of cells which have completed their 

 period of growth and subsequently 

 change little till they lose their 

 protoplasm and die (bot.}. 



Permian (peYmtan) a. [Perm, E. 



Russia.] The sixth rock-system of 

 the primary group (pall). 



peronate (peVonat) a. [L. peronatus, 

 rough - booted.] Covered with 

 woolly hairs ; powdery or mealy 

 externally (btol.}. 



peroneal (pgrone'al) a. [Gk. perone, 

 the fibula.] Pert, or lying near the 

 fibula ; appl. artery, nerve (anat.}. 



peroneotibial (peYone'otlb'Ial) a. [Gk. 

 perone, fibula ; L. tibia, the tibia.] 

 In the region of fibula and tibia ; 

 appl. certain muscles (anat.}. 



peronium (pSro'mum) n. \Gk.perone, 

 a fibula.] In Trachomedusae, one 

 of the mantle-rivets, or cartilaginous 

 processes ascending from the disc 

 margin towards the centre (zoo/.). 



peroral (pSro'ral) a. [L.fler, through ; 

 os, mouth.] Appl. a membrane of 

 Infusoria formed by concrescence 

 of rows of cilia (zoo/.). 



peroxidase (pgrflk'sidas) n. [L. per, 

 through ; Gk. oxys, sharp.] An 

 enzyme which causes the activation 

 of peroxide oxygen (phys.}. 



perradius (peYra'dtus) n. [L. per, 

 through ; radius, a radius.] One of 

 four primary radii of Coelenterates 

 (zoo/.). 



persistent (pSrsIs'tSnt) a. [L. per, 

 through ; sistere, to be fixed.] Re- 

 maining attached till maturation, 

 as a corolla (dot.} ; appl. organs or 

 parts in the adult which normally 

 disappear with larval stage or 

 youth, as gills (zoo/.). 



person (peVs5n) n. [L. persona, a 

 person.] An individual or zooid of 

 a colony (zoo/.). 



personate (peYsonat) a. [L. person- 

 atus, masked.] Appl. a corolla of 

 two lips, closely approximated and 

 with a projection of the lower closing 

 the throat of the corolla (dot.}. 



perspiration (peYspfra'shun) n. [L. 

 per, through ; spirare, to breathe.] 

 Exudation or excretion through the 

 pores of the skin (phys.}. 



pertusate (pgrtu'sat) a. [L. pertusus, 

 thrust through.] Pierced at the 

 apex (oof.). 



perula (peVula, pgr'oola) n. [Gk. 

 Pera, a wallet.] A leaf-bud scale 

 (bot.}, 



pervalvar (pgrval'var) a. [L. per, 

 through ; valvae, folding-doors.] 



