| 释义 |
tetramerous, a.|tɪˈtræmərəs|
[f. mod.L. tetramer-us (ad. Gr. τετραµερής four-parted, f. τετρα- tetra- + µέρ-ος part) + -ous.]
Having, consisting of, or characterized by four parts. spec. a. Bot. Having the parts of the flower-whorl in series of four. (Often written 4-merous.) b. Entom. Having the tarsi four-jointed, as the Tetramera among Coleoptera. c. Having four rays, as a starfish.
1826Kirby & Sp. Entomol. III. xxxv. 684 Tetramerous insects are those in which all the tarsi consist of four joints. 1835Lindley Introd. Bot. (1848) I. 316 Tetramerous, if [a flower consists of organs] in fours. 1857Henfrey Elem. Bot. 230 Papaveraceæ... Flowers regular, 2-merous or 4-merous. 1859Darwin Orig. Spec. vii. (1873) 173 All the other flowers on the plant are tetramerous. 1861Hulme tr. Moquin-Tandon ii. iii. vi. 157 A tetramerous Coleopter belonging to the family Rhyncophora.
So teˈtrameral a., having parts in fours; also, belonging to the Tetrameralia, a subdivision of the Hydrozoa Acraspeda in Claus's classification; tetrameˈralian a. = tetrameral; n. a member of the Tetrameralia; ˈtetramere, a division of the fourth order in the supporting reticular skeleton of the extinct siliceous sponges (Cent. Dict. Suppl. 1909); teˈtramerism, the condition of being tetramerous; division into four parts or into sets of four.
[1888Rolleston & Jackson Anim. Life 789 I. Tetrameralia: with four radial sectors... II. Octomeralia: with eight sectors.] 1888Amer. Nat. XXII. 941 The morphological significance of the primary subdivision into four or tetramerism of the germ-bands of Stenobothrus and Œcanthus. 1899Syd. Soc. Lex., Tetramerism. |