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

  • n. The protective cap or hood covering the spore case of a moss or related plant.
  • n. A similar hoodlike, lidlike, or caplike structure, such as a root cap.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. In bryophytes, a thin, hood-like tissue that forms from the archegonium and covers the developing sporophyte.

from the GNU version of the Collaborative International Dictionary of English

  • n. A little hood or veil, resembling an extinguisher in form and position, covering each of the small flasklike capsules which contain the spores of mosses; also, any similar covering body.

from The Century Dictionary and Cyclopedia

  • n. A hood; a covering; a lid.
  • n. [capitalized] In zoology: Same as Calyptræa.
  • n. A genus of lepidopterous insects.
  • n. A genus of cœlenterates.

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

  • n. the hood or cap covering the calyx of certain plants: e.g., the California poppy


Medieval Latin, from Greek kaluptra, veil, from kaluptein, to cover; see kel-1 in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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