单词 | tetraxon |
释义 | > as lemmastetraxon tetraxon n. and adj. Brit. /tᵻˈtraksɒn/ , /tɛˈtraksɒn/ , U.S. /təˈtrækˌsɑn/ , /tɛˈtrækˌsɑn/ (a) n. a sponge-spicule with four axes radiating from a centre; (b) adj. having four axes of growth. [ < tetra- comb. form + ancient Greek ἄξων axis (see axon n.).] ΘΚΠ the world > animals > invertebrates > subkingdom Parazoa > phylum Porifera > [adjective] > relating to a sponge > of parts of sponge > having four axes tetraxon1886 tetraxile1888 1886 Proc. Zool. Soc. 21 Dec. 581 Spicules more or less clearly tetraxon, often branched. 1887 W. J. Sollas in Encycl. Brit. XXII. 416/2 [article Sponges] Tetraxon Quadriradiate Type (Calthrops).—Growth from a centre in four directions inclined at about 110° to each other. < as lemmas |
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