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单词 tropidial
释义 tropidial, a. Zool.|trəʊˈpɪdɪəl|
[f. Gr. τρόπις, τροπιδ- keel + -ial.]
Pertaining to the tropis or keel of a C-shaped sponge-spicule.
1887Sollas in Encycl. Brit. XXII. 418/1 (Sponges) The pterocymba is subject to considerable modifications;..the pteres may be lamellar or ungual; additional lamellæ (tropidial pteres) may be produced by a lateral outgrowth of the keel.
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