Glossary 347 



Nar-COt'ic (Gr. vapicdeiv, to benumb). A substance that produces stupor, 

 convulsions, and sometimes death. 



Nic'0-tine. The poisonous alkaloid found in the leaves of the tobacco 

 plant. 



Nu-cle'o-lus (Lat. dim. of nucleus). A small body often found within the 

 nucleus of a cell. 



Nu'cle-us (Lat. nucleus, kernel). An essential part of a typical cell, often 

 spherical and usually found near the center. 



Nu-tri'tion (Lat. nutrire, to nourish). The processes by which the nourish- 

 ment of the body is accomplished. 



0-don'toid (Gr. odofa, a tooth, and eiSos, shape). The name of the bony peg 



of the second vertebra, around which the first turns. 

 (E-soph'a-gus (Gr. <ptpeiv, ofoeiv, to carry, and <j>ayeii>, to eat). The tube 



leading from the throat to the stomach ; the gullet. 

 0-lec'ra-non (Gr. uXtvrj, the elbow, and Kpaviov, the top of the head). A 



curved eminence at the upper and back part of the ulna. 

 Os-mo'sis (Gr. 0)07*65, impulsion). Diffusion of liquids through membranes. 

 Os'sa in-nom-i-na / ta, pi. of os innominatum (Lat.). The irregular or 



" unnamed " bones of the pelvis, so called on account of their non- 

 resemblance to any known object. 

 O'to-co'ni-a (Gr. ofo, an ear, and Kovia, dust). Minute crystals of lime in 



the vestibule of the ear; also known as otoliths. 

 Ox-i-da'tion (Gr. 6us, sharp). The union of oxygen with other substances, 



as in combustion. The essential part of burning and of breathing. 



Pa-cin'i-an cor/pus-cles (Pacini, an Italian physician). One of the forms 



of end organs for the sense of touch. 

 Pal'ate (Lat. palatum, the palate). The roof of the mouth, forming the hard 



palate, and the curtain at the back of the mouth, called the soft palate. 

 Pal'pi-ta'tion (Lat. palpitatio, a frequent or throbbing motion). A violent 



and irregular beating of the heart. 

 Pa-pilTae (Lat., a nipple). The small elevations found on the skin and 



mucous membranes. 

 Pa-rary-sis (Gr. irapaXfaiv, to loosen; also, to disable). Loss of function, 



especially of motion or feeling. 

 Par'a-site (Gr. ra/od, near, and <T?TOS, food). A plant or animal living upon 



or within another organism, called the host. 



Pervis. Literally, " a basin " ; the bony cavity at the lower part of the trunk. 

 Pep'sin (Gr. Trtirretv, to cook). A ferment found in the gastric juice, and 



capable of digesting proteids in the presence of an acid. 



