PLA 



326 



PLA 



disease, exhibiting a slight red- 

 ness of limited portions of the 

 skin, on which small, thin scales 

 are formed and fall off called 

 dandrijf when it affects children : 

 pityroid, a., p&tr-fyd (Gr. eidos, 

 resemblance), bran or scurf-like. 



placenta, n., plds-ent'-a (L. 

 placenta, a cake ; Gr. plaJcous, 

 a flat cake), a flat, round body 

 formed in the womb during 

 pregnancy, and serving to connect 

 the circulation of the mother and 

 child coming away a few 

 minutes after delivery, it is 

 commonly known as the after- 

 birth ; in bot, the cellular part 

 of the carpel bearing the ovule : 

 placentary, n., plas-8nt'dr-i, in 

 bot. , a placenta bearing numerous 

 ovules : placenta!, a., plas-Zntf-al, 

 pert, to the placenta : n., a 

 mammal having a placenta : 

 placentation, n., plds'Znt-d'shun, 

 in bot., the manner in which the 

 seeds are attached to the pericarp ; 

 the manner in which the placentas 

 are developed. 



placoid, a. , plakf-oyd (Gr. plax, a 

 plate, plakos, of a plate ; eidos, 

 resemblance), applied to the 

 irregular bony plates, grains, or 

 spines found in the skin of 

 various fishes, as skates, rays, 

 dog-fish, and sharks : n., an 

 Order of fishes. 



plagiostomi, n. plu., pladfi-os'- 

 tom-l (Gr. plagffis, transverse ; 

 stoma, a mouth), the Sharks and 

 Rays in which the mouth is 

 transverse, being placed on the 

 under surface of the head. 



Planarida, n. plu., plan-ar'id-a 

 (Gr. pianos, wandering), a Sub- 

 order of the Turbellaria. 



plantse tristes,n. plu., plant' e trist' 

 ez (L. plantce, plants ; trfalis, 

 sad, melancholy, tristes, plu.), 

 melancholy plants, so named 

 because they expand their flowers 

 in the evening only, as some 

 species of Hesperis, Pelargonium, 

 etc. 



Plantaginacese, n. plu., plant- 

 adj'm-d'se-e (L. plantdgo, a 

 plantain from planta, the sole 

 of the foot, from the leaves lying 

 flat on the ground), the Ribwort 

 family, an Order of plants 

 having radical ribbed leaves, 

 and the species are frequently 

 bitter and astringent : Plantago, 

 n., plant- dg'o, a genus of plants, 

 usually called Plantains : Plant- 

 ago maritixna, mar-it'-im-a (L. 

 marltimus, belonging to the sea 

 from mar&, the sea), a species 

 found on the sea-shores, and on 

 the highest mountains in Scot- 

 land : P. major, madf-tir (L. 

 major^ greater), the Way-bred, 

 which follows the footsteps of 

 man in his migrations, the 

 spiklets are used for feeding 

 birds : P. decumbens, d&'ktim'* 

 b$nz (L. decumbens, lying down), 

 a native of Egypt, India, etc., 

 whose seeds are used to form a 

 demulcent drink in diarrhoea. 



plantar, a.,pldnt'ar (L. plantdris, 

 belonging to the sole of the foot 

 from planta, the sole of the 

 foot), pert, to the sole of the 

 foot : plantaris, a., plant- dr'is, 

 applied to a muscle arising from 

 the external condyle of the femur, 

 and which extends to the foot. 



plantigrade, a., pldnt'4-grdd (L. 

 planta, the sole of the foot ; 

 gradior, I walk), placing the 

 sole of the foot to the ground 

 in walking: n., an animal that 

 does so, as the bear. 



planula, n.,plan'-ul-d (L. pldntila, 

 a little plane from pldnus, flat), 

 the oval ciliated embryo of certain 

 of the Hydrozoa. 



planum temporale, pldn<&m t$mp'- 

 dr-dl'8 (L. pldnus t plane ; 

 temptirdlls, lasting but for a 

 time), the temporal plane ; the 

 parietal part of the temporal 

 ridge of the skull, which bounds 

 a surface somewhat flatter than 

 the rest, forming part of the 

 temporal fossa. 



