264 GLOSSAEY. 



Occipi'tal. [From the Lat. occiput, occipitis, the "back of the head."] Per- 

 taining to the occiput, the back pai't of the head. 



Odon'toid. [From the Gr. odons, odontos, a " tooth," and eidos, " form," " re- 

 semblance."] Tooth-like. 



(Ede'ma. [From the Gr. oideo, to " swell."] A swelling from effusion of 

 serous fluid into the areolar tissue. 



(Esoph'agus. [Gr. oisophagos, from oio, (f ut.) oiso, to " carry," and phagema, 

 "food."] The gullet. 



Olec'ranon. [From the Gr. olene, the " elbow," and kranon, the " head."] 

 The head of the elhow. 



O'lein. [From the Lat. oleum, " oil."] One of the three chief constituents 

 of fat. Oil (^oleuin) signifies literally, juice of the olive (l^at. olea). 



Olfac'tory. [From the Lat. olfacio, olfactum, to " smell."] Belonging to the 

 sense of smell. 



Omen'tum. [Lat. "entrails."] A duplicature of the peritoneum with more 

 or less fat interposed. 



Ophthal'mic. [From the Gr. ophthalmos, the " eye."] Belonging to the eye. 



Op'tic. [From the Gr. opto, to "see."] That which relates to sight. 



O'ra Serra'ta. [Lat.] Serrated border. 



Orbicula'ris. [From dim. of Lat. orhis, an "orb" or "circle."] Name of the 

 circular muscles. 



Or'bitaL [From the Lat. orbita, a "track," "rut of a wheel."] Pertaining 

 to the 07-bit, the bony cavity in which the eyeball is suspended. 



Os, pi. Ora. [Lat.] A mouth. 



Os, pi. Ossa. [Lat.] A bone. 



Osmo'sis. [From the Gr. usmos, "impulsion."] Diffusion of liquids through 

 membranes. 



Os'sa Innomina'ta, pi. of Os Innomina'tum. [Lat.] " Unnamed bones." The 

 irregular bones of the pelvis, unnamed on account of their non-resemblance 

 to any known object. 



Os'teoblasts. [From the Gr. osteon, a " bone," and blastos, a " germ " or 

 "sprout.*'] The germinal cells deposited in the development of Jione. 



O'toliths. [From the Gr. ovs, the "ear," and lithos, a "stone."] Particles 

 of calcium carbonate and phosphate found in the internal ear. 



O'vum, pi. O'va. [Lat. an " egg."] The human germ-cell. 



Oxida'tion. The action of oxidizing a body ; that is, combining it with oxy- 

 gen, the result of which combination is an oxide. 



Ox'ygen. A tasteless, odourless, colourless gas, forming part of the air, 

 water, etc., and supporting life and combustion. 



Pal'mitin. A solid, crystallizable substance of fat, found in the nervous tissue. 



Pal'pebra, pi. Pal'pebrae. [Lat.] The eyelid. 



Pan'creas. A compound secreting gland ; one of the accessory organs of 



nutrition. The sweetbread of animals. 

 Papil'lae. [Lat. pi. of papilla, a "nipple," a "pimple."] Minute eminences 



on various surfaces of the body. 

 Paraglob'ulin. A. proteid substance of the blood plasma. 

 Pari'etaL [From the Lat. paries, parietis, a "wall."] Pertaining to a ivalL 



