GLOSSARY. 



47 



thunder). To explode, or cause to 

 explode. 



Detona'tion (Lat. de, from ; tono, I 

 thunder). An explosion or sudden 

 report. 



De'trahent (Lat. de, down ; traho, I 

 draw). Drawing down. 



Detri'tus (Lat. de, down; tero, I 

 rub). That which is worn off 

 from solid bodies, as rocks, by 

 friction : generally applied to the 

 more finely divided portions. 



Detru'sion (Lat. de, from ; trudo, I 

 thrust). A thrusting from or 

 down. 



Deu'tero- or Deuto- (Gr. Seurepos, 

 deu'teros, second). A prefix, deno- 

 ting the second degree of the word 

 joined with it. 



Deutox'ide (Gr. Seurepos, deu'teros, 

 second ; oxide). The compound 

 of a body with oxygen, containing 

 the next greatest quantity of oxygen 

 to the protoxide, or basic oxide. 



Development (Fr. devcloppcr, to un- 

 fold). An unfolding ; the change 

 which takes place in living bodies 

 in their progress towards maturity. 



Devo'nian (Devon). In geology, a 

 term applied to the old red sand- 

 stone system, of which portions are 

 particularly developed in Devon- 

 shire. 



Dew-point. The temperature at 

 which the watery vapour in the 

 atmosphere begins to be deposited 

 on the surface of the earth. 



Dextrin (Lat. dexter, right). A sub- 

 stance resembling gum, and used 

 in art as a substitute for it : so 

 called from turning the plane in 

 polarised light to the right hand. 



Diibe'tes (Gr. Sia, dia, through; 

 fiaivaj, baino, I go). An immode- 

 rate flow of urine. 



Diacous'tics (Gr. Sia, dia, through ; 

 O.KOVU, akouo, I hear). The science 

 of refracted sounds. 



Diadel'pMa (Gr. Sis, dis, double ; 

 aSe\(pos, adel'phos, a brother). A 

 class of plants in the Linnsean sys- 

 tem, having the filaments of the 

 stamens united into two parcels. 



Dise'resis (Gr. Sia, dia, apart ; aipeco, 

 haired, I take). A separation ; iu 



grammar, the separation of a syl- 

 lable into two ; or the mark ", 

 which denotes that the vowel on 

 which it is placed is separated from 

 that which precedes it. 



Diagnosis (Gr. Sia, dia, through or 

 between ; yivaa-Kw, ginos'ko, I 

 know). A distinction or differ- 

 ence ; in medicine, the distinction 

 of one disease from another. 



Diagonal (Gr. Sia, dia, through ; 

 yuvia, gonia, an angle). A line 

 drawn from one angle of a four- 

 sided figure to the opposite angle. 



Di'agram (Gr. Sia, dia, through; 

 ypa<f)(i>, grapho, I write). A figure 

 drawn for the purpose of giving a 

 general idea of an object, without 

 accuracy in minute details. 



Di'alect (Gr. Sia, dia, separate ; \eya>, 

 lego, I speak). The form in which 

 the parent language of a state is 

 spoken in a province. 



Dial'lage' (Gr. StoAAcryr?, interchange). 

 In mineralogy, a mineral con- 

 sisting of silica and magnesia of a 

 changeable colour; in rhetoric, a 

 figure by which arguments are 

 placed in different points of view, 

 and then brought to bear upon one 

 point. 



Diamagnet'ic (Gr. Sia, dia, through; 

 /j.ayvi)s, maynts, a magnet). A 

 term applied to substances which, 

 under the influence of magnetism, 

 take a position at right angles to 

 the magnetic meridian. 



Diamag'netism (Gr. Sia, dia, 

 through ; fj.ayvr)s, magnes, & mag- 

 net). A peculiar property of many 

 bodies, which, not being themselves 

 magnetic, are repelled bysufiiciently 

 powerful electro-magnets, and take 

 a position at right angles to the 

 magnetic equator. 



Diam'eter (Gr. Sia, dia, through ; 

 He-rpov, metron, a measure). A 

 straight line passing through the 

 centre of a body from one side to 

 the other. 



Dian'dria (Gr. Sis, dis, double ; arnp, 

 aner, a man). A class of plants in 

 the Linnasan system, having two 

 stamens. 



Diaph'anous (Gr. Sia, dia, through ; 



