38 GLOSSARY. 



Depura'tion (L. depiiro, to cleanse, purify). The clearing 



away of impurities. 

 Der'mal (Gr. derma, a skin). Relating or belonging to the 



skin. 

 Der'mis (Gr. derma, a skin). The vascular layer of the skin, 



sometimes called the true skin, also the cutis vera. 

 Derotrema'ta (Gr. dere, neck ; trema, a hole). A division of 



the Urodele amphibians having one or two gill-clefts on 



each side of the neck. 

 Desmo'gnathae (Gr. desmos, a bond ; gnathos, a jaw). A term 



applied to those Carinate birds which have the maxillo- 



palatine bones united. 

 Desquama'tion (L. de, away from; squama, a scale). The 



falling away of scales. 

 Detru'sor uri'nae (L. detrudere, to push away, eject ; urma, 



urine). A muscle of the bladder, the contraction of which 



assists in the discharge of the urine. 

 Deuterosto'matous (Gr. deuteros, second; stoma, a mouth, 



opening). A term applied to a gastrula in which the 



original blastopore completely closes up, a new aperture 



or apertures being subsequently formed. 

 Diabe'tes (Gr. dia, through; baino, I go on). A disease in 



which an abnormal secretion of liver sugar takes place, 



and is passed out of the system in the urine, the secretion 



of which is also greatly augmented. 

 Diagno'sis (Gr. distinguishing, deciding). The recognition of 



a disease by its symptoms. 

 Dialysis (Gr. dia, apart ; luo, I loosen). The passage of a 



crystalloid substance by diffusion through a septum from 



one fluid to another. 

 Dia'phragm (Gr. dia, across; phragma, a fence). The mus 



cular partition which separates the abdominal and thoracic 



cavities in the Mammalia. 

 Dia'physis (Gr. dia, through ; phusis, growth). The centre of 



ossification in the shaft of a long bone. 

 Diapo'physis (Gr. apophuo,\.Q sprout). The superior transverse 



process of a vertebra when two such processes are present. 

 Diarthro'sis (Gr. dia, through; arthron, a joint). An anato- 

 mical term for a movable articulation of bones. 

 Diaste'ma (Gr. dia, apart; histemi, to place). A gap or inter- 

 val, as between teeth. 

 Dias'tole (Gr. diastello, to dilate). The rhythmical expansion 



or dilatation of the heart. 



