DIAMYLENE 



100 



BICHLORIDES 



Diamylene, (di-am'i-len). [Gk. dig, twice; 

 Amylene,g.r.]=(C5H 10 )2 ' used for two equi- 

 valents of amylene, as in diamylene oxide= 

 C 10 H 20 0. 



Diana monkey =Cercopithecus sp. : has a white 

 crescentic band on the forehead. 

 Dianchora, (di-ang^ko-ra). A fossil belonging 

 to Lamellibranchiata. 



Diandria, (di-an'dri-a). [Gk. dig, twice; aner, 

 man.] A sub-division of plants according 

 to the Linnaean system, including those hav- 

 ing two distinct stamens. 

 Dianilides, (di-an'i-Hdz). [Gk. dis, twice; Ani- 

 lide, q.v.] Derivatives of aniline, containing 

 two equivalents of aniline. 

 Dianthus, (di-an'thus). [Gk. dios, the god; 

 an/ios,flower,called Jupiter's flower.]=Pink, 

 carnation, &c., an herb belonging to Caro- 

 phyllaceae. 



Diapason, (dl-a-pa'zon). [Gk. dia, through; 

 pas, the whole.]=;Octave: all the notes in- 

 cluded in an octave; also used generally, as 

 including all of any given set of notes. 

 Diapensiaceae, ( di-a-pen-si-S'se-e ) = Diapen- 

 siads: prostrate shrubs, with terminal flowers, 

 belonging to Gentianales. 

 Diaphaneity, ( di-a-fa-ne'i-ti ). [ Gk. dia, 

 through; phainein, to show.] The property 

 of being transparent or diaphanous. 

 Diaphanous, (di-af'a-mis), [Gk. dia, through; 

 phaino, I show.]=Traiisparent: permitting 

 the passage of light so perfectly that objects 

 can be clearly distinguished. 

 Diaphragm, (di'a-fram). [Gk. diaphragma, 

 partition. ]=Phren: a muscular partition be- 

 tween the thorax and abdomen of man, the 

 contraction of which is essential to breathing; 

 found also in all mammals, and, more or less 

 modified, in most Vertebrata, but not in in- 

 vertebrate animals. D. shell : divided in 

 two by a diaphragm ; the larger part being 

 filled with bullets, the smaller with powder. 

 Diaphysis, (di-af'is-is). [Gk. dia, through; 

 physis, growth.] The centre of ossification of 

 the shaft of a long bone. 

 Diapophyses, ( di-a-pof i-sez ). [ Gk. dia, 

 through ; apophysis, branch.] Tubercular 

 transverse processes in the vertebrae. 

 Diaspore, (di'a-spor). [Gk. diaspora, disper- 

 sion. J^AlsOsHgO: a mineral, chiefly hydrate 

 of alumina; named from breaking into small 

 pieces when heated. 



Diastase, (di'a-stas). [Gk. diastasis, separa- 

 tion.] An albuminous substance which con- 

 verts starch into sugar during the germina- 

 tion of seeds. 



Diastema, (di-a-ste'ma). [Gk. diastemi, I sepa- 

 rate.] A space, especially between the can- 

 ine and other teeth, found in most mammals, 

 bvit not in man. 



Diastole, (di-a-stoae). [Gk. diastello, I send 

 apart. ] The dilation of a ventricle or auricle 

 of the heart, cf. Systole. 

 Diastopora, (di-as-to-po'ra). A Bryozoan ani- 

 mal, known only by fossil remains in Oolite 

 rocks. 



Diastylidae, (di-a-stI-li-de)=;Cumace8e: small 

 crustacean, animals belonging to Ppdoph- 



Diathermancy, (dl-a-ther'man-si). [Gk. dia, 



through; therme, heat.] The property of 



allowing the passage of heat, i.e., of trans- 

 mitting radiant heat. 



Diathermic, (dl-a-ther'mik). [Gk.dia,through; 

 therme, heat.] Allowingheat to pass through. 



Diathermometer, (di-a-ther-mom'e-ter). [Gk. 

 dia, through; Thermometer, q.v.] An in- 

 strument for measuring the thermal resist- 

 ance of any given substance by noting the 

 amount of heat transmitted by it. 



Diatomaceae, (di-a-to-ma'se-e). [Gk. diatemno, 

 I cut through. ]= Brittle- worts: slimy, crys- 

 talline, microscopic bodies, which multiply 

 by fission, found in damp places and at the 

 bottom of deep seas, belonging to Algales; 

 also called Splitters. The term is also ap- 

 plied to thesilicious coverings of these plants. 



Diatomic, ( di-a-tom'ik ). [Gk. dis, twice; 

 Atomic, g.v.]= Dyadic : used of an atom or 

 a molecule which can combine with or re- 

 place two monatomic equivalents. 



Diatoms, (di-a-tornz)=Diatomace8e, q.v. 



Diatonic scale, (di-a-ton'ik). [Gk.tiia.through.] 

 From any note to its octave, above or below; 

 eight notes having their rates of vibration in, 

 the ratio of 24, 27, 30, 32, 36, 40, 45, 48. 



Dibasic. Having two atoms of replaceable 

 hydrogen in each molecule. 



Dibenzoyl, ( di-ben'zoil ). [Gk. dis, twice; 

 Benzoyl, q.v.]=(C?H 5 0)<>: the radicle of the 

 benzoic series, a crystalline substance; the 

 molecular form of benzoyL 



Dibenzyl, (di-ben'zil). [Di and Benzyl, q.v.]= 

 (C-'K'?)n: the radicle of the benzyl series, a 

 crystalline substance, the molecular formula 

 of benzyl. 



Dibenzylia, (di-ben-zil'i-a). [Di and Benzyl, 

 q.v.]=(C^Hj)^H.N : an aniline base, usually 

 in the liquid form ; ammonia in which two 

 equivalents of hydrogen are replaced by two 

 of benzyl. 



Dibranchiata, (di-brang-ki-5'ta). [Di, q.v.; 

 bragchia, gills. ]= Cuttle-fishes, &c.: a divi- 

 sion of Cephalopoda, including all the more 

 highly organised mollusca of that class, that 

 have not more than ten arms, on which are 

 suckers; only two gills, and an ink-bag. 



Dibutyl, (di-bu'til). [Di and Butyl, q.v.]= 

 (C4H9)2=Octane=Valyl: a hydrocarbon ob- 

 tainedln the distillation of coal; the mole- 

 cular formula of butyl. 



Dibutyril, ( di-bu'ti-ril ). [Di and Butyril.] 

 =(C4H7O)2=the molecular form of buty- 

 ril. 



Diceras, (di'se-ras). [Gk. dis, two: keraa, 

 horn.] A horn-like Lamellibi'anchiate ani- 

 mal, known only by fossil remains in Coral 

 Rag. 



Dichlamydeje, (di-klam-id'e-e). [Di, q.v.; Gk. 

 chlamys, cloak.] Plants the flowers of which 

 have both calyx and corolla, cf. Achlamydese. 

 Dichlorides, (di-klo'ridz). [Di and Chloride, 

 q.v.] Compounds of one atom of an element, 

 with two atoms of chlorine, siich as baric 

 and calcic chlorides, all of which are usually 

 solid. The molecule.'of a dichloride contains 

 two atoms of chlorine, united with a positive 

 or basic radicle. 



