| 单词 | triradiate |
| 释义 | triradiate, a. (n.)|traɪˈreɪdɪət|
[f. as prec.: see radiate a. and -ate2 2.]
Having or consisting of three rays; radiating in three directions from a central point; three-rayed, trifurcate.
1846Patterson Zool. 60 Three beautiful little semicircular horny saws, arranged in a triradiate manner, so that their edges meet in the centre. 1874Cooke Fungi 36 The triradiate spores of Asterosporium. 1875Huxley in Encycl. Brit. I. 754/2 Each pterygoid..is a triradiate bone, with an anterior, an inner, and a posterior, or outer, ray.
B. n. A triradiate sponge-spicule.
1887Sollas in Encycl. Brit. XXII. 417/1 (Sponges) The shorter paired rays being termed basal, and the whole spicule a sagittal triradiate. 1911A. Dendy in Encycl. Brit. XXV. 722/1 The triradiates and quadriradiates..are not simple spicules, but spicule-systems formed of three or four rays each originating independently from its own scleroblast.
So triˈradiated |-eɪtɪd|, a. = triradiate; triˈradiately adv., in a triradiate manner (Cent. Dict. 1891); triradiˈation, radiation in three directions; also, a triradiate figure or structure.
1786Phil. Trans. LXXVI. 160 The cavity..is divided into..chambers or compartments by solid transverse septa, which communicate with each other by a triradiated aperture. c1900Buck's Handbk. Med. Sc. II. 177 The callosal eminence.., the hippocamp, and the occipital eminence form an irregular triradiation. |
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