62 



GLOSSARY. 



science which describes the relation 

 of the different varieties of mankind 

 to each other. 



E'tiolate. To whiten by excluding the 

 rays of the sun. 



E'tiology (Gr. curia, aitia, a cause ; 

 Ao7os, logos, a discourse). A de- 

 scription of causes; in medicine, the 

 department of the science which 

 . studies the agents by which diseases 

 are produced. 



Etymol'ogy (Gr. eVujUos, et'umos, 

 true ; \oyos, logos, a word). A 

 description of the origin, derivation, 

 and changes of words. 



Et'ymon (Gr. cry/toy, et'umos, true). 

 The root of a word, from which it 

 is derived. 



Eudiom'eter (Gr. eu, eu.well ; 5ios, dios, 

 air ; /jLtrpov, met r on, a measure). 

 An instrument for measuring the 

 amount of oxygen contained in air 

 or in gaseous mixtures. 



Eudiom'etry (Gr. eu, eu, well ; Stos, 

 dios, air ; ^rpov, metron, a 

 measure). The art, of measuring 

 the quantity of oxygen in the air or 

 in gaseous mixtures. 



Eu'phemism (Gr. eu, eu, well ; (j>vi/j.t, 

 phemi, I speak). The substitution 

 of a delicate or agreeable word for 

 one which is offensive. 



Euphon/ic (Gr. eu, eu, well; <t>(avt], 

 phone, voice). Having an agree- 

 able sound. 



Eu'phony (Gr. eu, eu, well ; $UVT), 

 phone, voice). A combination of 

 letters and syllables which is agree- 

 able to the ear. 



Eusta'chian Tube (Eusta 1 chius, a 

 celebrated anatomist). The tube 

 which connects the internal ear 

 with the back part of the mouth. 



Eusta'chian Valve. A fold of mem- 

 brane lying between the anterior 

 margin of the lower vena cava and 

 the right auricles of the heart. 



Evac'uant (Lat. e, from ; vac'uo, I 

 empty). Emptying. 



Evac'uate (Lat. e, out ; vac'uo, I 

 empty). To empty or free from. 



Evacuation (Lat. e, out ; vac'uo, 

 I empty). An emptying or clear- 

 ing. 



Evap'orate (Lat. e, from ; vapor, 



vapour). To pass off in vapour ; to 

 convert into vapour. 



Evaporation (Lat. e, from ; vapor, 

 vapour). The conversion of a fluid 

 into vapour or steam ; the removal 

 of fluid from any substance by con- 

 verting it into vapour. 



Evec'tion (Lat. e, out ; veho, I carry). 

 A carrying out ; in astronomy, an 

 inequality in the moon's place, pro- 

 duced by the mean progression of 

 the apsides, and the variation of 

 the excentricity. 



Evolu'tion (Lat. e, out ; volvo, I roll). 

 An unfolding or unrolling ; in al- 

 gebra and arithmetic,, the extraction 

 of a root, or the unfolding of a num- 

 ber multiplied into itself any num- 

 ber of times ; in military affairs, 

 changes in the position and arrange- 

 ment of troops. 



EvuTsion (Lat. e, from ; vello, I 

 pluck). A pulling out by force. 



Exacerba'tion (Lat. ex, from ; acer'- 

 bus, sharp). Irritation ; an in- 

 crease in violence. 



Exalbu'minous (Lat. ear, from ; allu'- 

 men). Without albumen. 



Exan'thema (Gr. e, ex, out ; avBos, 

 anthos, a flower). An eruption : 

 now applied to contagious diseases, 

 attended by fever and by an erup- 

 tion on the skin. 



Excen'tric. See Eccen'tric. 



Excentricity. See Eccentric'ity. 



Excision (Lat. ex, from ; ccedo, I 

 cut). A cutting off. 



Excitability (Lat. ex, from ; cito, I 

 provoke). The power of being 

 roused to action. 



Exci'tant (Lat. ex, from ; cito, 1 

 provoke). Calling into action ; 

 stimulating. 



Exci'to-mo'tor (Lat. excito, I excite ; 

 moveo, I move). A term applied 

 to those actions which arise from 

 an impression made on the extremity 

 of a nervf, conveyed to the spinal 

 cord, and thence reflected, without 

 sensation, to the nerves supplying 

 the muscles of the part moved. 



Excoriate (Lat. ex, from ; co'rium, 

 the skin). To strip off the skin. 



Ex'crement (Lat. ex, from ; cerno, I 

 separate). Refuse matter. 



