n. [Gr. oion, egg; genesis, beginning; topos, place]
A small cellular complex following the oviduct within the female reproductive system where shell membranes form, enclosing the zygote and several vitelline cells; see columella.

Online Dictionary of Invertebrate Zoology. . 2005.

Look at other dictionaries:

  • 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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