see columella.

Online Dictionary of Invertebrate Zoology. . 2005.

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  • columella — n. [L. dim. of columna, column] 1. A rod, pillar or column. 2. (CNIDARIA: Anthozoa) The central skeletal mass of many corals. 3. (MOLLUSCA: Gastropoda) The solid or hollow pillar of a univalve shell around which the whorls are arranged. 4.… …   Dictionary of invertebrate zoology

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