Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A small opening or pore, as of a fruiting body.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A small hole or opening through which certain fungi release their mature spores.
  • n. A similar hole or opening in plants, such as the opening of the involuted fig inflorescence through which fig wasps enter to pollinate and breed.

from the GNU version of the Collaborative International Dictionary of English

  • n. The exterior opening of a stomate. See stomate.
  • n. Any small orifice.

from The Century Dictionary and Cyclopedia

  • n. A small opening or entrance; a little ostium.
  • n. In zoology: One of the small inhalant pores or orifices of sponges.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a small pore especially one in the reproductive bodies of certain algae and fungi through which spores pass

Etymologies

Latin ōstiolum, diminutive of ōstium, opening; see ostium.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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