266 GLOSSARY. 



Pig'ment. [From the Lat. pigmentum, " paint," " colour."] Colouring matter. 



Pin'na. [Lat. a " feather " or " wing."] External cartilaginous flap of the 

 ear. 



Placen'ta. [Lat. a " thin, flat cake."] A fiat, circular, vascular substance 

 which forms the organ of nutrition for the foetus in utero. 



Plan'tar. [From the Lat. planta, " the sole of the foot."] Pertaining to the 

 sole of the foot. 



Plas'ma. [From the Gr. plasso, " to form."] A tenacious plastic fluid con- 

 taining the coagulating portion of the blood ; that in which the blood- 

 corpuscles float ; the liquor sanguinis. 



Pleu'ra. [Gr. the " side."] A serous membrane divided into two portions, 

 lining the right and left cavities of the chest, and reflected over each 

 lung. 



Plex'us. [From the Lat. plecto, plexum, to " knit " or " weave."] A network 

 of nerves or veins. 



Pneumogas'tric. [From the Gr. pneumon, a " lung," and gaster, the " stom- 

 ach."] Pertaining to the lungs and stomach. 



Polyhe'dral. [From the Gr. polys, " many," and hedra, a " base," a " side."] 

 Many-sided. 



Pons Varo'lii. [Lat.] " Bridge of Varolius." The white fibres which form 

 a bridge connecting the different parts of the brain, first described by 

 Varolius. 



Poplite'al. [From the Lat. poples, poplitis, the "ham," the "back part of the 

 knee."] The space behind the knee-joint is called the popliteal space. 



Prismat'ic. Resembling a prism, which, in optics, is a solid, glass, triangular- 

 shaped body. 



Prona'tion. [From the Lat. pronus, " inclined forwards."] The turning of 

 the hand with the palm forwards. 



Prona'tor. The group of muscles which turn the hand palm forwards. 



Pro'teids. A general term for the albuminoid constituents of the body. 



Pro'toplasm. [From the Gr. protos, "first," and plasso, to "form."] AJirst- 

 formed organized substance ; primitive organic cell matter. 



Pseudostom'ata. [From the Gr. pseudes, "false," and stoma, stomatos, a 

 " mouth."] False openings. 



Pter'ygoid. [From the Gr. pteron, a "wing," and eidos, "form," "resem- 

 blance."] Wing-like. 



Pty'alin. [From the Gr. ptyalon, "saliva."] A ferment principle in saliva, 

 having power to convert starch into sugar. 



Pu'bes, gen. Pu'bis. [Lat.] The external part of the generative region ; 

 the portion of the os innominatum forming the front of the pelvis. 



Pul'monary. [From the Lat. pulmo, pi. pulmones, the " lungs."] Relating 

 to the lungs. 



Pylor'ic. Pertaining to the pylorus. 



Pylor'us. [From the Gr. pyle, a " gate " or " entrance," and ouros, a 

 "guard."] The lower orifice of the stomach, furnished with a circular 

 valve which closes during stomach digestion. 



Pyrex'ia. [From the Gr. pyresso, (fut.) pyrexo, to " have a fever."] Eleva- 

 tion of temperature ; fever. 



