GLOSSARY. 257 



Cy'toplasm. [From the Gr. kutos, a "cell," and plasso, to "form."] The 

 name given by Kolliker to the contents of a cell: same as proto- 

 plasm. 



Decussa'tion. [From the Lat. decusso, decussatum, to "cross."] The crossing 

 or running of one portion athwart another. 



Del'toid. Having a triangular shape ; resembling the Greek letter A (delta). 



Den' drone. The name given to the branching processes of the neurone which 

 begin to divide and subdivide as soon as they leave the n ewe-cell. 



Dex'trin. A soluble substance obtained from starch. 



Dex'trose. C 6 H 12 O 6 . A form of sugar found in honey, grapes, and other 

 fruits. 



Diabe'tes Mel'litus. [From the Gr. dia, "through," baino, "to go," and meli, 

 " honey."] Excessive flow of sugar-containing urine. 



Dial'ysis. [From the Gr. dialyo, to " dissolve."] Separation of liquids by 

 membranes. 



Diapede'sis. [From the Gr. dia, " through," and pedad, to " leap," to " go."] 

 Passing, of the blood-corpuscles through vessel walls without rupture : 

 sweating of blood. 



Di'aphragm. [From the Gr. diaphrasso, to " divide in the middle by a parti- 

 tion."] The partition muscle dividing the cavity of the chest from that 

 of the abdomen. 



Diarthro'sis. [From the Gr. dia, "through," as implying no impediment, 

 and arthron, a " joint."] A freely movable articulation. 



Dias'tole. [From the Gr. diastello, to " dilate."] The dilation of the heart. 



Dip'loe. [From the Gr. diploo, to " double," to " fold."] The osseous tissue 

 between the tables of the skull. 



Diox'ide. [From the Gr. dis, " twice," and " oxide."] A compound contain- 

 ing two atoms of oxygen to one of base, or metal. 



Dis'cus Prolig'erous, or germ disk. A term applied to a mass of cell cling- 

 ing to the ovum when it is set free from the ovary. 



Dis'tal. [From the Lat. dis, " apart," and sto, to " stand."] Away from the 

 centre. 



Dor' sal. [From the Lat. dorsum, the " back."] Pertaining to the back or 

 posterior part of an organ. 



Duc'tus Arterio'sus. [Lat.] Arterial duct. 



Duc'tus Veno'sus. [Lat.] Venous duct. 



Duode'num. [From the Lat. duodeni, "twelve each."] First part of small 

 intestines, so called because about twelve fingers' breadth in length. 



Du'ra Ma'ter. [Lat.] The " hard mother," called dura because of its great 

 resistance, and mater because it was formerly believed to give rise to 

 every membrane of the body. The outer membrane of the brain and 

 spinal cord. 



Dyspnce'a. [From the Gr. dys, "difficult," and pneo, to "breathe."] Diffi- 

 cult breathing. 



Efferent. [From the Lat. effero, to " carry out."] Bearing or carrying out- 

 wards, as from the centre to the periphery. 



