DICHLORINATED 



101 



DIETHYLIA 



Dichlorinated ether, (di-klo-ri-na'ted)=(C 2 H 3 

 Ether in which two atoms of hdro- 



gen are displaced by chlorine; a heavy, oily, 



neutral liquid. 

 Dichlorisatin, (di-klo-ris'a-tin). [Di, chlorine, 



and isatin, g.v.]=C 8 H 3 Cl 2 NO 2 : isatin in 



which two atoms of hydrogen are replaced 



by chlorine. 

 Dichobune, (dik'-o-bun). [Gk. dicha, in two; 



bounos, ridge.] A terrestiial quadruped, 



Bomewhat resembling the hare, remains Of 



which are found in Eocene and Miocene 



strata, having the upper molar teeth deeply 



cut ; originally described as belonging to 



Anoplotberium. 

 Dichodon, (dik'o-don). [Gk. dicha, in two; 



odous, tooth. ] A hoofed qu ad ru ped, rem ains 



of which are found in Eocene strata, connect- 



ing the Anoplotherium with Ruminantia. 

 Dichogamous, (dik-og'a-mus). [Dichogamy, 



g.r.] Male and female organs not mature at 



same time. 

 Dichogamy, (dik-ogVmi). [Gk. dicha, in two; 



gamos, marriage.] Male and female flowers 



mature at different times, as in some ferns 



and angiosperms. 

 Dichotomies, (di-kot'o-mez). [Dichotomy, q.v.] 



Branch-systems formed by dichotomy. 

 Dichotomy, (di-kot'o-mi). [Gk. dicha, in two; 



temno, I cut.] Division by continual bifur- 



cation; common in ferns, but rare in pha- 



nerogamous plants. 

 Dichroism, (di'kro-izm). [Gk. dichromos, two- 



coloured.] Having different colours when 



seen in different directions. 

 Dichroite, (dik-ro'it). [Gk. dichromos, two- 



coloured.] A mineral, chiefly silicate of 



alumina. 

 Diclines, (di-kll'nez). [Gk. dis, twice ; Tcline, 



couch.] 'Jussieu's term for plants which have 



separate male and female flowers. 

 Diclinous, (di-kli'nus). [Gk. dis, twice; kline, 



couch.]=Unisexual : having the male and 



female organs on separate flowers. 

 Dicotyledons, ( dl-kot-i-le'donz ). [Di, q.v.: 



Gk. kotyledon, seed-leaf.] =Exogens: plants 



with pithy stems, separable bark, net-veined 



leaves, perianth usually in four or five parts, 



and embryo having two seed-leaves. 

 Dicotyledonous, (di-kot-i-led'o-nous). [Dicoty- 



ledons, q.v.] Related to dicotyledons. 

 Dicotyles=Peccaries. 

 Dicrotism, (di'kro-tizm). [Gk. dis, twice ; 



kroteo, I beat.] A double beating of the ar- 



terial pulse. 

 Dictamnus, (dik-tam'nus). A plant, which 



has an inflammable emanation, belonging to 



Rutacese. 

 Dictyogens, (dik'ti-o-jens). [Gk. diktyon, net; 



gennao, I produce. ] Plants intermediate 



between Endogens and Exogens. 

 Dictyotoptera, (dik-tio-top'ter-a). [Gk. dik- 



tyotos, veined; pteron, wing.]=Cockroaches: 



a name proposed by which to separate them 



from Orthoptera. 

 Dictyoxylon, (dik-ti-oks'i-lon). [Gk. diktyon, 



net; xylon, wood.] Fossil coal-plants, the 



wood of which has reticulated fibres. 

 Dicumyl, (di-ku'mil). [Di and Cumyl, q.v.] 



(CioHiiO) 2 : the molecular form of cumyl, 

 q.v. : a viscous oily substance. 



Dicynodon, (di-si'no-don). [Gk. di, two; kyon, 

 dog; odous, tooth.] A fossil reptile found in 

 Trias rocks. Has two tusks, teeth, and also a 

 horny beak to the jaws. 



Dicynodontia, (dis-i-no-don'shi-a). [Gk. di, 

 two; kyon, dog; odous, tooth.] Including 

 the Dicynodon and Oudenodon extinct rep- 

 tiles of the Triassic age, having two canine 

 teeth, found only in South Africa. 



Didelphia, ( di-del'fi-a ). [Didelphis, q.v. ] 

 One of the primary divisions of Mammalia, 

 g.u =Marsupialia, mostly Australian. 



Didelphidse, (di-delfi-dg). [Didelphis, q.v.] 

 =Opossums ; a family of American Marsu- 

 pialia, of which Didelphis is the type. 



Didelphis, (di-del'fis). [Gk. dis, two ; delphys, 

 womb. ] = Opossum : a marsupial animal, 

 now found only in America, the type of 

 Didelphidse. 



Didine, (di'dln). [Didus, g.v.J^Dodo-like: 

 related to the Dodo. 



Didunculus, (di-duuk'u-lus). [Diminutive of 

 Didus, q.v.] D. sn#iro<m=:Tooth-billed 

 pigeon of Navigator's Island, now probably 

 extinct, allied to the Dodo, 



Didus, (did'us). [The Latin name.]=Dodo, 

 q.v.: a large pigeon-like bird, extinct since 

 the end of the 16th century. 



Didymium, ( dl-dim'i-um ). [Gk. didymos, 

 twin.] 1. =Di : one of the earth-metals, vejy 

 rare, and closely resembling Lanthanum, 

 whence the name. 2. A small fungus with 

 double peridium. 



Didymocarpus, (dl-di-mo-kar'pus). [Gk. 

 didymos, twin ; karpos, fruit.] A plant 

 belonging to Gesneracese, named from its 

 twin-like capsules. 



Didymograpsus, ( di-dim-o-grap'sus ). [Gk. 

 didymos, twin; Grapsus.]=Doublegraptolite: 

 a Silurian zoophyte. 



Didymous, (did'i-mus). [Gk. didymos, twin.] 

 =In pairs. 



Didynamia, (di-di-na'mi-a). [Gk. dis, twice; 

 dynamis, power.] A sub-division in the 

 Linnaean system of botany, including plants 

 having 4 stamens, two long and two short, 

 with one pistil. 



Didynamous, ( di-din'a-mus ). [Didynamia, 

 q.v.] Having four stamens, two long and 

 two short. 



Dielectrics, (di-e-lek'triks). [Gk. dia, through ; 

 Electric, q. v.]= Non-conductors of electricity: 

 glass, air, sulphur, &c. ; substances which 

 have but a small power of transmitting 

 electricity by conduction, but are capable of 

 being polarised, and so acting by induction. 



Diethyl, (di-eth'il). [Di and Ethyl, q.v.]= 

 (C 2 H 5 ) 2 =Ethyl ethylide=Ethyl=Butyl hy- 

 dride : a gaseous hydrocarbon, the mole- 

 cular formula of ethyl, q.v. D. carbonate 

 Carbonic ether, q.v. 



Diethylenia, (di-eth-i-le'ni-a). [Di and Ethy- 

 lenia, q.v.] = (C 2 H 4 ) 2 H 2 N 2 = Acetylia=Die- 

 thylene diamine : an oily, odorous, inflam- 

 mable liquid, cf. Ethylenia. 



Diethylia, (di-eth-i'li-a). [Di and Ethylia, 

 <Z.v.]=(CaH 5 ) 2 HN : a caustic, inflammable, 



