GLOSSARY. 



307 



the reflected, and the late de- 

 cidua. The milk-teeth are called 

 deciduous, on account of being 

 shed. 



Decussation, decussatio a cutting 

 across in the form of the letter 

 X ; a crossing of fibres or other 

 structures, at right angles, and 

 also otherwise. 



Deglutition, de down, and glutlo 

 I swallow; the act of swallow- 

 ing. 



Dentine, dens a tooth ; the texture 

 of which the teeth in greater 

 part consist. 



Depuration, de away from, and 

 purus pure ; the clearing away 

 of impurities. 



Derma, dep^a a skin ; the cutis 

 vera. 



Desquamation, de and. squama a 

 scale; falling away of scales. 



Diaphragm, <5ia across, and $>pay- 

 M.O. a fence; any partition (as the 

 diaphragm of a microscope), by 

 means of which the aperture for 

 the admission of light is dimin- 

 ished ; the midriff or muscular 

 partition separating the thoracic 

 from the abdominal cavity. 



Diaphysis, cid right through, and 

 </>uc7i9 growth ; the centre of os- 

 sification of the main length or 

 shaft of a long bone. 



Dicrotism, <5/'-: twice, and Kporew 

 I. be&t ; the double beating of 

 the arterial pulse. 



Digestion, digero I divide; the 

 conversion of the food into a 

 substance capable of absorption. 



Discus proligerus, disc bearing the 

 offspring ; a coating of granules 

 on the ovum. 



Dorsal, dor sum the back ; is pro- 

 perly used in opposition to 

 ventral ; but in the case of the 

 dorsal vertebrae, it is applied to 

 the twelve vertebrae which bear 

 the ribs, and ought to be sup- 

 planted by the word thoracic. 



Ductus communis choledochus, 

 v-j\i7 bile, and oe'xo/icu I re- 

 ceive ; the common bile duct. 

 Duodenum, duodeni twelve; the 

 part of the intestine immedi- 



ately succeeding the stomach ; 

 named from being considered 

 about twelve finger -breadths 

 long. 



Dura mater, hard mother; the 

 name of the tough fibrous cover- 

 ing of the brain and spinal cord. 



Electrotonus, *j\6KTpov amber, 

 and TOVO<S tension ; the electric 

 condition into which a nerve is 

 thrown when a continuous cur- 

 rent of electricity passes along 

 any part of its course. m 



Embryo, fyppvov (ev within, and 

 /fyuco I swell) ; the young before 

 birth ; applied principally to 

 the very early stages of exist- 

 ence, and used in reference to 

 plants as well as animals. 



Embryology, e/nftpvov, and Xo'yo? 

 discourse ; the study of develop- 

 ment. 



Emunctory, emungo I wipe ; any 

 j>art by which waste matter is 

 got rid of. 



Enamel, in French email, in 

 Italian smalto, /ue'\oo> I melt ; a 

 fused substance spread on a sur- 

 face ; the name given to the ex- 

 ceedingly hard texture which 

 covers the crowns of the teeth. 



Encephalon, lv within, and /CE- 

 <pa\v the head; the whole brain 

 down to where the medulla ob- 

 longata is continued into the 

 spinal cord. 



Endogenous, ev&ov within, and 

 yevvait) I bring forth ; growing 

 in the interior of the pre-exist- 

 ing structure. 



Endolymph, ev&ov within, and 

 lympha water ; the fluid within 

 the membranous labyrinth. 



Endosmosis, eV<W within, and 

 wOe'w I push ; the current from 

 without inwards, when diffusion 

 of fluids takes place through a 

 membrane. 



Endothelium, evdov within, and 

 QdXXa) I bloom ; an exceedingly 

 delicate coating of squamous 

 corpuscles found in the interior 

 of capillary blood-vessels and 

 lymphatics, 



