PITH ECANTH ROPUS 



419 



PLANOCVTE 



mammals the respiratory center is injured so as to 

 cause immediate death; hence this method is some- 

 times used in slaughtering. 

 Pithecanthropus. Sing, of Pithecanthropi. (See 

 Illus. Diet. ) P. erectus, a fossil ape-man of Java 

 discovered by a Dutch military surgeon, Eugene Du- 

 bois, in 1894. 

 Pithecoid {pith'-e-koid) [rridr/Koc, an ape; eldn^, like- 

 ness]. Resembling an ape. P. Theory, the theory 

 if man's descent from the ape. 



ita. (See Illus. Diet.) 2. Colorless, transparent, 

 stringy sputum, frothy at the top, and which when the 

 froth has been removed, resembles water stirred up 

 with white of egg (Laennec). P. alba, anasarca. 

 Pituital (pit-u'-it-al). Relating to pituita. 

 Pituri (pit-u'-rc). The dried and powdered tops and 

 leaves of Duboisia hopuioodii, F. v. Miill., the masti- 

 catory of the aborigines of Central Australia, corre- 

 ponding to the betel nut (Areca catechu) of the Eastern 

 Archipelago or the taezi-kaat ( Catha edulis) of Arabia, 

 n small quantities it is a powerful stimulant, assuaging 

 lunger and enabling long journeys to be made without 

 tigue. It was introduced into medicine in 1873. 

 yn., Pitchiri ; Pitch e ry ; Bedgery ; Pedgery. 

 rin ( pit-u'-rin). A brown, liquid, acrid alkaloid 

 isolated from pichuri by Livirsidge, 1880. 

 Pityriasis. (See Illus. Diet.) P. furfuracea, sebor- 

 rhcea sicca. P., Gibert's, P., Hebra's. See P. 

 rosea (Illus Diet.). P. indica. See P. nigra (Illus. 

 Diet.). P. linguae, leukoplakia. P. versicolor. 

 (See Illus. Diet. ) C. W. Allen's iodin test is of value 

 for recognition of suspected areas ; it consists in the 

 application of iodin solution, preferably Lugol's (iodi, 

 5; potass, iodidi, 10 ; aquae, loo). The diseased 

 portion will stain deep brown or mahogany color, in 

 contrast to the light yellow coloration of healthy tissue. 

 Piuri [pi-u'-re). Indian yellow, a coloring-matter used 

 in water-colors, made in India from the urine of cows 

 fed on mango leaves. 

 Pivot. (See Illus. Diet.) P., Clack, P., Clacking, 

 a means devised by Magiola for attaching an artificial 

 crown to the root of a natural tooth. 

 Pixine (piks'-?n). A surgical dressing said to consist 



of Burgundy pitch with a wool fat base. 

 Pixol ( piks*-ol ). A solution of wood tar in soap. 

 Place, Kiesselbach's. The point at which the nasal 

 septum, owing to its thinness, is especially liable to 

 perforation. 

 Placenta. (See Illus. Diet. ) Syn., Deuterion. See 

 Law, Leopold' s. P., Accessory. See P. succen- 

 riata (Illus. Diet). P. biloba, P. bipartita. See 

 Dimidiate. P. circumvallata, a thickening or 

 fungiform enlargement of the placenta at the point 

 t which the decidua vera and the decidua reflexa 

 ould have united in cases in which such union 

 is been thwarted by hypersecretion of the 

 ormer or by endometritic processes. P., Dimi- 

 iate, one with two lobes. P., Duncan's Posi- 

 ion of, the marginal position generally assumed by 

 e placenta on presenting itself at the os uteri for ex- 

 ulsion. P. inclusa. See P. incarcerata (Illus. 

 ict. ). P. oblata, P. obvia, placenta pnevia. P., 

 Reflexal, one formed by development of chorionic vHli 

 on the decidua reflexa. P., Schultze's Position of, 

 the position assumed by the placenta when its central 

 portion bulges downward and is expelled in advance 

 of the periphery. P., Stone, one containing calca- 

 reous deposits. P., Student's, a retained placenta 

 due to improper manipulation. P. triquetra, P. uni- 

 lobata, an intermediate form between the usual pla- 

 centa and the placenta succenturiata, in which there is 

 marked projection of a portion of the border, as if a 



lobe were about to be detached. P. uteri, P., 

 Uterine, P. uterina, the maternal placenta. P. 

 zonaria, P., Zonary. See P., Annular (Illus. 

 Diet.). 



Placentoma ( pla-sen-to'-mah). A neoplasm springing 

 from a retained portion of a placenta. 



Placentophagy \pla-sen-tof-aj-e) [placenta ; oa^e'ir, 

 to eat]. The eating of the placenta by certain mam- 

 mals, and, as recorded by Carreri in 1 7 19, a custom 

 among the Yakouts, where the father and his friends 

 used to eat the placenta ceremonially. According to 

 Raynaud, of Algiers ( 1902), it is practised among the 

 Soudanese. 



Placentotherapy (pla-sen-to-ther'-ap-e) [■z'/anoic, a 

 flat cake; depaxeia, therapy]. The remedial use of 

 preparations or the placenta of animals in cases of 

 absent or defective lactation. Syn., Placental opo- 

 therapy. 



Placido's Disc. See under Disc. 



Plagiocephalism. See Plagiocephaly (Illus. Diet.). 



Plague. (See Illus. Diet.) P., Justinian, the first 

 epidemic of the bubonic plague in Europe of which 

 there is any precise record, beginning in the reign of the 

 emperor Justinian, 542 A.D., and lasting fifty years. 

 P. Loodiana [India]. Local name for anthrax. P., 

 Oriental. See Plague (Illus. Diet.). P., Siberian 

 Cattle. Synonym of Anthrax. 



Planation (pla-na'-shun). Harrison Allen's term for 

 those movements of the hand taking place in the plane 

 of the flexor surface of the forearm. 



Plancus (plang'-kus) [planca, a board]. I. A person 

 with flat feet. 2. Flat-footed. 



Plane. (See Illus. Diet.) P., Hodge's, a plane par- 

 allel to that of the pelvic inlet, passing through the 

 upper border of the os pubis and the middle of the 

 second sacral vertebra. P., Infraorbital, that part of 

 the orbital surface of the superior maxillary bone ectad 

 of the infraorbital canal. P., Listing's, the vertical 

 transverse plane perpendicular to the anteroposterior 

 axis of the eyeball, which passes through the center of 

 motion of the eyes and in which lie the vertical and 

 transverse axes of normal voluntary rotation. P.s, 

 Principal. See P., Focal (Illus. Diet.). 



Planiceps {pla'-ne-seps) [planus, flat ; caput, a head]. 

 Flat-headed. 



Planidens (pla'-ne-dens) [planus, flat; dens, a tooth]. 

 Having flat teeth. 



Planipes ( pla' '-ne-piz) [planus, flat; pes, a foot]. 

 Having flat feet. 



Planimeter ( pla-nim'-et-ur). 1. See Perimeter. 2. 

 An instrument which measures a plane by tracing the 

 periphery. 



Planiventer (pla-ne-z , ent / -ur) [planus, flat; venter, 

 the belly]. Having a flat abdomen. 



Planktonocrit ( plank-ton' -o-krit) [T:7nyxr6c, wander- 

 ing; Kpiros, estimated]. An apparatus invented by 

 Charles S. Dolley for the quantitative estimation of 

 plankton. 



Planococcus (plan-o-kok'-us) [rz/avr/, a wandering; 

 k6kkv£, a berry]. A genus of eubacteria of the family 

 Coccacea having cell division in one, two, or three 

 directions; cells separate, flagellated. 



Planocompressed ( pla-no-kom-prest'). So com- 

 pressed that the opposite sides are flat. 



Planoconcave { pla-no-kon-kai-'). Concave on one 

 surface and flat on the opposite side. 



Planoconical ( pla-no-kon'-ik-al). Having one side 

 flat and the other conical. 



Planoconvex ( pla-no-kon-veks 4 '). Plane on one side 

 and convex on the other. 



Planocyte {plan'o-sit) [tt'/ovji, a wandering; ki'toc, 

 cell]. A wandering cell. 



