tetractadj.n.

/ˈtɛtrakt/

Etymology: < tetra- comb. form + Greek ἀκτίς, ἀκτῑν- ray.

Zoology.

A. adj.

Having four rays or branches; quadriradiate.

ΘΚΠ

the world > animals > animal body > general parts > [adjective] > having rays > having four rays

tetract1886

tetractine1887

tetractinose1888

tetractinal1891

1886 Proc. Zool. Soc. 21 Dec. 581 The chief spicules are tetract.

B. n.

Categories »

A four-rayed sponge-spicule.

Derivatives

teˈtractinal adj.

ΘΚΠ

the world > animals > animal body > general parts > [adjective] > having rays > having four rays

tetract1886

tetractine1887

tetractinose1888

tetractinal1891

1891 Cent. Dict. Tetractinal.

teˈtractine adj. and n.

ΘΚΠ

the world > animals > animal body > general parts > [adjective] > having rays > having four rays

tetract1886

tetractine1887

tetractinose1888

tetractinal1891

the world > animals > invertebrates > subkingdom Parazoa > phylum Porifera > [noun] > member of > parts of > sponge spicule > having rays > having four rays

caltrop1887

tetractine1887

1887 W. J. Sollas in Encycl. Brit. XXII. 416 (Fig. 12) d. calthrops (tetraxon tetractine).

teˈtractinose adj.

ΘΚΠ

the world > animals > animal body > general parts > [adjective] > having rays > having four rays

tetract1886

tetractine1887

tetractinose1888

tetractinal1891

1888 W. J. Sollas in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXV. p. lix Tetractine.—When all four actines of a tetraxon are present it is..a tetractine, but as the full designation of this required to distinguish it from a tetractinose triaxon is tetractine tetraxon, we shall substitute for it the equivalent ‘calthrops’.

This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2018).

单词	tetract
释义	tetractadj.n. /ˈtɛtrakt/ Etymology: < tetra- comb. form + Greek ἀκτίς, ἀκτῑν- ray. Zoology. A. adj. Having four rays or branches; quadriradiate. ΘΚΠ the world > animals > animal body > general parts > [adjective] > having rays > having four rays tetract1886 tetractine1887 tetractinose1888 tetractinal1891 1886 Proc. Zool. Soc. 21 Dec. 581 The chief spicules are tetract. B. n. Categories » A four-rayed sponge-spicule. Derivatives teˈtractinal adj. ΘΚΠ the world > animals > animal body > general parts > [adjective] > having rays > having four rays tetract1886 tetractine1887 tetractinose1888 tetractinal1891 1891 Cent. Dict. Tetractinal. teˈtractine adj. and n. ΘΚΠ the world > animals > animal body > general parts > [adjective] > having rays > having four rays tetract1886 tetractine1887 tetractinose1888 tetractinal1891 the world > animals > invertebrates > subkingdom Parazoa > phylum Porifera > [noun] > member of > parts of > sponge spicule > having rays > having four rays caltrop1887 tetractine1887 1887 W. J. Sollas in Encycl. Brit. XXII. 416 (Fig. 12) d. calthrops (tetraxon tetractine). teˈtractinose adj. ΘΚΠ the world > animals > animal body > general parts > [adjective] > having rays > having four rays tetract1886 tetractine1887 tetractinose1888 tetractinal1891 1888 W. J. Sollas in Rep. Sci. Results Voy. H.M.S. Challenger: Zool. XXV. p. lix Tetractine.—When all four actines of a tetraxon are present it is..a tetractine, but as the full designation of this required to distinguish it from a tetractinose triaxon is tetractine tetraxon, we shall substitute for it the equivalent ‘calthrops’. This entry has not yet been fully updated (first published 1911; most recently modified version published online June 2018). < adj.n.1886
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