aperture

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aperture (noun; Latin aperire, to open): 1. An opening or hole, cleft, or gap.

2. (Arthropoda: Crustacea) The postero-ventral opening into the mantle cavity of barnacles

See also: orifice. 3. (Bryozoa: Stenolaemata) The terminal skeletal opening of a zooid. 4. (Mollusca) An opening at the last-formed margin of a shell, providing the outlet for the head-foot mass.

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