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ǁ Tropis. World English Historical Dictionary

ǁ Tropis. World English Historical Dictionary Dictionary Biographies Literary Criticism Welcome Terms of Service ⧏ Previous Next ⧐ Contents Slice Contents Key Bibliographic Record Murray’s New English Dictionary. 1916, rev. 2022. ǁ Tropis Zool. Pl. tropides. [mod.L., a. Gr. τρόπις keel.] The ‘keel’ or middle part of a cymba or C-shaped sponge-spicule, between the proræ or ‘prows.’

1 1887.  Sollas, in Encycl. Brit., XXII. 417/2. (Sponges) A truly C-shaped spicule…. The back of the ‘C’ is the keel or tropis; the points are the prows or proræ.

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