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

  • adj. Lacking an operculum.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Having no operculum; said of certain gastropod shells.

from The Century Dictionary and Cyclopedia

  • Having no true operculum, as a snail; specifically, of or pertaining to the Inoperculata.
  • In botany, not provided with an operculum or lid.
  • Also inopercular, inoperculated.


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