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. |