GLOSSARY. 257 



Myo'pia. [From the Gr. myo, to " contract," and ops, the " eye."] Near- 

 sightedness. 

 My'osin. Chief proteid substance of muscle. 



Na'ris, pi. Na'res. [Lat.] A nostril. 



Weurilem'ma. [From the Gr. neuron, a "nerve," and lemma, a "coat" or 



" covering."] Nerve-sheath. 

 Ni'trogen. A colourless gas forming nearly four-fifths of the atmosphere : 



the diluent of the oxygen in the air. Literally, that which generates 



nitre. 

 Nucle'olus, pi. Nucle'oli. [Dim. of Lat. nucleus, a "kernel."] A smaller 



nucleus within the nucleus. 

 Nu'cleus, pi. Nu'clei. [Lat. a "kernel."] A minute vesicle embedded in 



the cell protoplasm. 



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

 taining to the occiput, the back part of the head. 

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



"resemblance."] 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 elbow. 

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



of fat. Oil (oleum) signifies literally, juice of the olive (Lat. 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. opfo, to "see."] That which relates to sight. 

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

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



circular muscles. 

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



to the orbit, the bony cavity in which the eyeball is suspended. 

 Os, pi. O'ra. [Lat.] A mouth. 

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

 Osmo'sis. [From the Gr. osmos, " 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-re- 

 semblance 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 bone. 

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



