DECIDUAL 356 



Decidual [de-sid' '-u-al) [deciduus, a falling off]. 

 Belonging to the decidua. D. Cells, a proliferation 

 of young connective-tissue cells above the uterine 

 glands, taking place after the ovum is impregnated, 

 and producing an hypertrophy of the mucous mem- 

 brane of the uterus. D. Endometritis. See 

 Endometritis. 



Deciduoma [de-sid-u-o' -mah) [deciduus, a falling off; 

 6fia, a tumor: //. Deciduomata\. An intra-uterine 

 neoplasm, containing decidual relics, and believed to 

 arise from some hyperplasia of a retained portion of 

 the decidua. 



Deciduous [de-sid' '-u-us) [de, away,from ; cade re, to fall]. 

 In biology, falling off. Applied to leaves that fall in 

 autumn, and to the calyx and corolla when they fall 

 off before the fruit develops. In dental anatomy, ap- 

 plied to the milk-teeth or temporary teeth. D. Skin. 

 See Keratolysis. D. Teeth, the temporary teeth or 

 milk-teeth are so called because, after subserving the 

 purposes of early childhood, they are removed by an 

 operation of the economy, to give place to others of 

 a larger size and of a more solid texture. See Teeth, 

 Temporary. 



Decigram [des' -e-gram) [decimus, tenth ; gramma, 

 gram]. One-tenth of a gram or 1.54 grains troy. 

 See Metric System. 



Deciliter [des' -e-le-ter) [decimus, tenth; litra, liter]. 

 One-tenth of a liter, or 3.52 English fiuidounces or 

 3.38 U. S. fiuidounces. See Metric System. 



Decimeter (des' -e-me-ter) [decimus, tenth ; fierpov, a 

 measure]. One-tenth of a meter, or 3.937 inches. 

 See Metric System. 



Decinormal (des-e-nor'-mal) [decimus, tenth ; norma, 

 normal]. Having one-tenth the strength of the 

 normal, as a solution. 



Deck Plug [dek' plug). A short wooden cylinder that 

 may be of various sizes, used by ship-builders, and 

 employed in pathologic laboratories for making 

 paper boxes in which the specimens may be embed- 

 ded. A strip of thin paper is wound around the plug 

 and held in place by a rubber band, sufficient paper 

 projecting above to form a cylindric box with a wooden 

 bottom. 



Declinate (dek'-lindt) [de, down ; clinare, to bend]. 

 In biology, bent downward. 



Declination (dek-lin-a' -shun) [declinare, to decline]. 

 The dip of the magnetic needle. 



Declinator (dek'-lin-a-tor) [declinare, to decline]. An 

 instrument for keeping the dura out of harm's way 

 during the act of trephining. 



Decline (de-klln') [declinare, to bend]. A marked 

 deterioration ; weakness of the body ; an enfeebling 

 chronic state of disease : the decreasing stage, as of a 

 fever. Also a popular term for Pulmonary tuberculosis. 



Declivis cerebelli (de-kli'-vis ser-e-bel' -i) [L.]. The 

 sloping posterior aspect of the monticulus of the cere- 

 bellum. 



Decoction (de-kok'-shun) [decoquere, to boil down]. A 

 decoction, or " tea." In pharmacy, a liquid prepara- 

 tion obtained by boiling vegetable substances in water. 

 There are two official decocta, besides one in the 

 national formulary, and twelve in the British phar- 

 macopeia. 



Decoctum (de-kok'-tum) [L. : //. , Decocta"]. A de- 

 coction. 



Decollated (de-kol'-a-ted) [de, away, from ; collum, 

 neck]. In biology, applied to univalve shells the 

 apices of which have been lost ; beheaded. 



Decollation (de-kol-a'-shun). See Decapitation. 



Decollator (de-kol'-a-tor) [decollare, to behead]. An in- 

 strument used in embryotomy for decapitating the fetus. 



Decoloration (de-kul-or-a' -shun) [decolorare, to deprive 



DEELUSLE OLEUM 





of color] . The operation of discharging the color of 

 an organic substance, usually by bleaching or by 

 filtration through animal charcoal. 



Decolorize (de-kul'-or-lz) [decolorare , to deprive of 

 color]. To remove the excess of coloring-matter 

 from stained histologic preparations, for purposes of 

 differentiation. 



Decomposition (de-kom-po-zish' -un) [decomponere, to 

 decompose]. The separation of the component prin- 

 ciples of a body, either by chemic analysis or by 

 putrefactive fermentation. 



Decompound (de-kom' -pound) \_de, away, from; com- 

 positus, compound]. In biology, many times com- 

 pound, as certain leaves. 



Decongestive [de-kon-jes'-liv) [de, from ; congerere, to 

 bring together]. Relieving congestion. 



Decortication [de-kor-tik-a' -shun) [de, from ; cortex, 

 tire bark]. I. The operation of removing or stripping 

 the bark or husk of a plant. 2. The stripping off of 

 portions of the cortical substance of the brain from the 

 summits of the gyri. This lesion is often witnessed in 

 post-mortem examinations of the brain after death 

 from paretic dementia, and is partly due to the ab- 

 normal adhesion of the gray matter to the meninges. 



Decrepit (de-krep'-it) [decrepitus, old]. Broken down 

 with age. 



Decrepitation (de-krep-it-a' -shun) \_decrepitare, to 

 crackle]. The crackling noise made by certain 

 crystalline bodies when their water of crystallization 

 is driven off by heat. It is caused by the conversion 

 of the imprisoned water into steam. 



Decrepitude (de-krep'-it-ud) [decrepitus, decrepit]. 

 The state of being decrepit ; senility ; the feebleness 

 of old age. 



Decrescent (de-kres / -ent) [decrescere, to decrease]. In 

 biology, gradually tapering or diminishing from below 

 upward. 



Decubitus (de-ku'-bit-us) [decumbere, to lie down]. A 

 term denoting a recumbent or horizontal position. 

 Also, the position of a sick person while in bed. D., 

 Acute, a form of bed-sore, sometimes seen in con- 

 nection with cerebral lesions. 



Decumbent (de-hum' -bent) [de, down ; cumbere, to 

 lie]. In biology, bent to one side ; reclining. 



Decurrent (de-kur'-ent) [de, down ; currere, to run]. 

 In biology, applied to leaves that are prolonged 1 

 the side of the stem below the point of their insertion. 



Decussate (de-kus'-at) [decussatus, cross]. In bio 

 arranged in pairs that successively cross each other. 

 To intersect. A term applied to nerve-fibers and to 

 muscle fibers that interlace. 



Decussatio (de-kus-a'-she-o) [L.]. A crossing. D. 

 pontinalis (more correctly pontilis), in the 1 

 decussation of tegmental fibers from the thalamus. 



Decussation (de-kus-a' -shun) [decussatio, a cros- 

 Achiasma or X-shaped crossing, especially of n< 

 or of nerve-filaments. The principal decussation 

 that of the optic nerve, and that of tlie pyramids 

 of the anterior pyramids of the oblongata. 



Decussorium (de-kus-o'-re-um) [L.]. An instn 

 for depressing the dura after the operation of trephii 

 ing, so as to facilitate the removal of pus, bio 

 abnormal effusions. 



Dedentition (de-den-tish' '-un) [de, down ; 



tooth]. The shedding of the teeth, especially t!i 

 milk-teeth. 



Dedolation (ded-o-la'-shuti) [dedolatio, a hewing CO 

 The removal of a slice by cutting ; a wound by 

 a part is cut off. 



Deduplication [dc-du-plik-a' -shun) [deduplicare, t> 

 divide in two]. In biology, the same as Chorisis, 



Deelinae Oleum. A highly refined petroleum oil D 



