ostium definition

  • noun:
    • A small opening or orifice, as with a body organ or passageway.
    • Any of the small open positions or pores in a sponge.
    • A small orifice or orifice, as in a body organ or passage.
    • the small open positions or pores in a sponge.
    • An opening; a passage.
    • An opening or entry; a mouth; an os.
    • In zoology: In sponges, the opening of an incurrent channel.

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