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A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation.

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  1. n. A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation.
  2. A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or æstivation.
  3. A membranaceous or calcareous septum with which some mollusksclose the aperture of the shell during the time of hibernation, oræstivation.
  4. n. A membranaceous or calcareous septum with which some mollusks close the aperture of the shell during the time of hibernation, or aestivation.