GLOSSARY 473 



" tendon."] A flat wide band of fibrous tissue which is attached to a 



muscle. 

 Arach'noid. [From the Gr. arachne, a " spider," a " spider's web," and 



eidos, " form," or " semblance."] Resembling a web. The middle 



of the three membranes of the brain and spinal cord. 

 Arboriza'tions. A growth or an appearance resembhng the figure of a 



tree or plant. 

 Are'olar. [From the Lat. areola, a " small space," dim. of area.] A 



term apphed to a connective tissue containing small spaces ; also to 



the colored area surrounding the nipple. 

 Arrec'tor. [From the Lat. arrectus, " set up erect."] That which arrects. 



The arrector of the hair. 

 Arte'rioles. [Arteriola, dim. of Lat. arteria, ^' artery."] A small artery. 

 Arteriosclero'sis. [See artery below. Lat. scleroticus, from Gr. skleroo, to 



" harden."] Hardening of the arteries. 

 Ar'tery. [From the Gr. aer, " air," and tereo, to " keep."] Literally, 



an air-keeper (it being formerly believed that the arteries contained 



air). A blood-vessel which carries blood from the heart. 

 Arthro'dia. [From the Gr. arthron, a " joint."] A variety of movable joint. 

 Articula'tion. [From the Lat. articulus, " a joint."] The more or less 



movable union of bones, etc. ; a joint. 

 Asphyx'ia. [From the Gr. a, " without," and sphyxis, the " pulse."] 



Literally, without pulse. Condition caused by non-oxygenation of 



the blood. 

 Assimila'tion. [From the Lat. ad, " to," and similis, " Uke."] The 



conversion of food into living tissue. 

 At'las. The first cervical vertebra by which the head articulates with 



the spinal column, so called because it supports the head as Atlas 



was fabled to support the world on his shoulders. 

 At'rophy. [From the Gr. a, " without," and trophe, " nourishment."] 



Wasting of a part from lack of nutrition. 

 Aud'itory. [From the Lat. audio, auditum, to " hear."] Pertaining to 



the sense or organ of hearing. 

 Augmenta'tion. The act of increasing or making larger. 

 Aur'icle. [From the dim. of Lat. auris, the " ear."] A little ear, a term 



apphed to the ear-shaped cavities of the heart, also to the expanded 



portion of the external ear. 

 Automat'ic. [From the Gr. automatos, "self -moving."] Not voluntary, 



not under the control of or affected by voUtion. 



