392 



DISTILLATION 



Dissemination {dis-em-in-a' -shun) \dis, apart ; setnin- 

 are, to sow]. The scattering or dispersion of disease 

 or disease-germs. 



Dissepiment [dis-ep' '-e-ment) [dis, apart ; scepire, to 

 hedge in]. A partition, septum, or diaphragm. 



Dissipation (dis-ip-a' 'shun) [dissipare, to scatter]. A 

 dispersion of matter or of the morbid conditions that 

 cause disease. 



Dissociation (dis-so-se-a* -shun) [_dis, apart ; sociare, to 

 associate]. In physiology, the separation of the com- 

 ponent elements of a compound. In chemistry, the 

 decomposition of a compound by means of high tem- 

 perature D. Symptom, anesthesia to pain and to 

 heat and cold, with preservation of tactile sensibility 

 and of the muscular sense ; it is observed in syringo- 

 myelia. 



Dissolution {dis-o-lu 1 '-shun) [dissolutio ; dissolvere, to 

 set free]. A solution of the continuity of a part. De- 

 composition arising from the death of the body or its 

 parts ; death. 



Dissolvent (diz-ol' -vent) \dissolvere, to loosen, dis- 

 solve]. A solvent. 



Dissonance {dis' -o-nans) \dissononare , to disagree in 

 sound] . The combination of such tones as are so dif- 

 ferent from each other as to produce beats. 



Distad [dis' -tad) [distare, to be at a distance ; ad, to]. 

 In the direction of the free extremity of an appendage 

 or part. See Position and Direction, Table of. 



Distal {dis f -tal) [distare, to be at a distance]. At the 

 greatest distance from the trunk, heart, or mesial line. 

 See Position and Direction, Table of. D. Clot. See 

 Clot. 



Distally [dis'-tal-e) [distare, to beat a distance]. Dis- 

 tad. 



Distance (dis' -tans) \distantia, distance]. The 

 measure of space between two objects. D., Working, 

 in the microscope, the distance from the front lens 

 of an objective to the object, when the objective is 

 correctly focused. 



Distemper (dis-tem' -per) \_distemperare , to dissolve]. I. 

 Disease ; malady ; indisposition ; most commonly 

 applied to the diseases of animals. 2. A disease of 

 young dogs, commonly considered as a catarrhal dis- 

 order. D. Colors. See Pigments, Colors, and Dye- 

 stuffs. 



Disten (dis f -ten) \distare,to\>& at a distance]. Belong-- 

 ing to the distal aspect in itself. 



Distention {dis-ten' '-shun) \_distendere, to stretch]. 

 The state of being dilated. 



Distichiasis (dis-tik-V -as-is) [Siq , double ; orixo<;, a 

 row]. The condition of a double row of eyelashes, 

 the inner rubbing against the globe. 



Distichous (dis'-lik-us) [Aiorixog, having two rows]. 

 In biology, in two perpendicular rows ; applied to the 

 arrangement of leaves or other organs. 



Distillation (dis-til-a' '-shun) [destillare, to drop little 

 by little]. The double process of vaporization and 

 condensation of the vapor. This is used mainly in 

 purifying liquids by separating them from non-volatile 

 substances. D., Destructive, the decomposition of 

 a substance in a close vessel in such a manner 

 obtain liquid products. The substances that are sub- 

 mitted to destructive distillation are in the main solids, 

 as wood, coal, shales, bones, and animal refuse. D., 

 Fractional, a process of decomposition of complex 

 liquid bodies depending upon the fact that, if a mixture 

 of liquids, each having a different boiling-point, be 

 heated, the one having the lowest boiling-point will 

 pass over first, and if the temperature is not increased 

 beyond that point at which the distillation of this 

 fraction takes place, no other constituent will come 

 over; if the temperature be gradually increased the 



