• WordNet 3.6
    • n calyptra the hood or cap covering the calyx of certain plants: e.g., the California poppy
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Webster's Revised Unabridged Dictionary
    • n Calyptra kȧ*lĭp"trȧ (Bot) 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.
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Century Dictionary and Cyclopedia
    • n calyptra A hood; a covering; a lid. Specifically, in botany: The hood of the theca or capsule of mosses. It is the archegonium which has continued to grow and has been carried up by the elongation of the peduncle of the capsule. In liver-worts the archegonium is burst through by the growing peduncle, and remains at its base.
    • n calyptra [capitalized] In zoology: Same as Calyptræa.
    • n calyptra A genus of lepidopterous insects.
    • n calyptra A genus of cœlenterates.
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Chambers's Twentieth Century Dictionary
    • n Calyptra ka-lip′tra a hood, covering, esp. that of the theca or capsule of mosses
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Webster's Revised Unabridged Dictionary
NL., fr. Gr. kaly`ptra a covering for the head, fr. kaly`ptein to cover
Chambers's Twentieth Century Dictionary
Gr., a veil.


In literature:

B, Similar plant with an almost mature sporogonium; s, seta; f, capsule; c, calyptra.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Part 3" by Various
Calyptra: a hood or cap; see alula.
"Explanation of Terms Used in Entomology" by John. B. Smith
Calyptra, applied to the portion of volva covering the pileus.
"The Mushroom, Edible and Otherwise" by M. E. Hard
Calyptra turnip-shaped, abruptly globose above.
"The Manual of the Botany of the Northern United States" by Asa Gray