GLOSSARY 331 



Met'a-tar'sal (Greek, meta, between, and tarsos, the flat of the foot). 



the five bones of the instep. 



Mi'cro-scope (Greek mikros. small, and skopeo, I look at), an instru- 

 ment for looking at very small objects. 

 Mi'tral valves (Latin mitra, head dress, especially for a bishop), the 



valves between the left auricle and ventricle ; the bicuspid 



valves. 

 Mo'lar (Latin inola, mill, from inolere, to grind in a mill), the last 



teeth on each side of the jaw ; the grinding teeth. 

 Mo'tor areas (Latin movere, motns, to move), those areas of the 



brain that control the movements of the muscles. 

 My'o-sin (Greek niys, myos, muscle), a proteid substance found in 



muscle cells ; one of the proteid foods obtained from lean 



meats. 

 Nar-cot'ic (Greek n'arkotikos, from narke, torpor, numbness), a drug 



that produces sleep, as opium. 

 Nic'o-tine (from Nicot, a Frenchman, who first introduced tobacco in 



France), the poisonous element in tobacco. 

 Ni'tro-gen (Latin nit nun, niter, and -gen, producing), an element 



forming about four fifths of the air we breathe. 

 Nu'cle-us (Latin, small nut, kernel), the central mass seen in nearly 



all cells. 



Nu-tri'tious (Latin nutrire, nutritus, to feed, nourish), full of nour- 

 ishment. 

 Oc-cip'i-tal (Latin occiput, back of the head), relating to the back of 



the head, as the occipital bone, the occipital lobe of the 



brain. 

 (E-soph'a-gus (Greek oisophagos, from oiso, I shall bear, and phagein. 



to eat), the tube that carries food from the pharynx to the 



stomach ; the gullet. 



01-fac'to-ry (Latin olere, to smell, and facer e, fact us, to make), per- 

 taining to the sense of smell. 

 O'pi-um (Greek opion, poppy juice), a drug made from the juice cf 



the poppy. 



Op'tic (Greek optikos), pertaining to the sense of sight. 

 Or' bit (Latin or bis, a circle), the eye socket. 

 Or'gan (Latin organum, implement), a collection of tissues arranged 



in some definite and compact way to perform some special 



function. 



