DIA 



123 



DIG 



tem'd, a gap or interval, especially 

 between teeth. 



diastole, n., di-as'tol-e (Gr. dias- 

 tole, separation from did, 

 through, separation ; stello, I set 

 or place), the dilatation or open- 

 ing of the heart after contraction; 

 the contraction is the ' systole. ' 



diathesis, n., di-ath'-Zs-is (Gr. 

 diathesis, a disposing or putting 

 in order from dia, through ; 

 tithemi, I put or place), a peculiar 

 state or condition of body, which 

 predisposes an individual to a 

 disease or a group of diseases. 



Diatomacese, n. plu., dl'-a-tom-O!- 

 se-e, also Diatoms, n. plu., dl'-at- 

 6ms (Gr. diatome, dissection, 

 division from dia, through, 

 asunder; tome, a cutting the 

 filaments being divided into 

 joints), an Order or tribe of Algae, 

 which are provided with siliceous 

 envelopes, the fronds consisting 

 of frustula or fragments united 

 by a gelatinous substance, and 

 which inhabit still waters and 

 moist places : Diatoma, n., dl-dt- 

 dm- a, very minute species of 

 Algse, found in the sea, and ditches, 

 at all seasons : diatomine, n., 

 di-dt f >om-in, a buff-coloured sub- 

 stance found in diatoms, which 

 conceals the green colour of the 

 chlorophyl. 



Dibothria, n. plu.,dz-bdth<ri'd (Gr. 

 dis, twice ; bothros, a hole, a pit), 

 a genus of tape-worms : diboth- 

 rium decipiens, di-both f >ri-um 

 de-sip'i-ens (L. decipiens, en- 

 snaring), a parasitic worm infest- 

 ing the small intestine of the cat: 

 d. serratum, ser-rdt^um (L. ser- 

 ratus, saw-shaped), a parasitic 

 worm infesting the small in- 

 testine both of the dog and 

 fox. 



Dibranchiata, n. plu., di-brdngk' 

 i-dt'-a (Gr. dis, twice, double ; 

 brangchia, the gills of a fish), 

 the Order of Cephalopoda in 

 which only two gills are present, 

 as in the cuttle-fishes : dibranch- 



iate, a., di'brdng&i-dt, having 

 two gills. 



dichasium, n., di-kdz'i-um (Gr. 

 dichdso, 1 divide into two), in 

 bot., a form of definite inflores- 

 cence in which each primary axis 

 produces a pair of opposite lateral 

 axes, each of which produces a 

 similar pair. 



dichlamydeous, a., dikf-ldm-id'- 

 e-us (Gr. dis, twice, double ; 

 chlamus, a cloak, a garment), in 

 bot., having a calyx and corolla ; 

 having two whorls in the flowers. 



dichogamous, a. , di- kog' dm - Us 

 (Gr. dicha, in two parts ; gameo, 

 I marry), applied to plants in 

 which the stamens and stigmas 

 of the same flower do not reach 

 maturity at the same time. 



Dichopetalum, n., dik'-d-pM-dl-tim 

 (Gr. dicha, in two parts ;petalon, 

 a leaf), a genus of plants, Ord. 

 Umbelliferee, one of whose species 

 in Victoria has five petaloid 

 sepals. 



dichotomous, a., dik-St'tim-us (Gr. 

 dichotomos, cut in two from 

 dicha, in two parts ; tome, a cut- 

 ting), in bot. , having the divisions 

 of a stem always in pairs ; furcate 

 or forked : dichotomous cyme, a 

 definite inflorescence in which the 

 secondary axes are produced in 

 pairs, each one ending in a single 

 flower : dichotomy, n., dik-6t f - 

 om-i, a mode of branching by 

 constant forking. 



diclesium, n., dl'kle^-i-um (Gr. 

 diklis, twice-shutting from dis, 

 twice ; kleid, I shut), a small, 

 dry, indehiscent pericarp, having 

 the indurated perianth adherent 

 to the carpel, and forming part of 

 the shell ; a fruit composed of an 

 indehiscent, one-seeded pericarp, 

 invested by a persistent and in- 

 durated perianth, as in 'mirab- 

 ilis. ' 



diclinous, a., di-ldln'-us (Gr. dis, 

 twice ; kline, a couch), in bot., 

 having the male and female organs 

 in separate flowers ; unisexual. 



