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单词 tetraxon
释义

> as lemmas

tetraxon
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.
extracted from tetra-comb. form
<
as lemmas
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