Definitions

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

  • n. An enclosing membrane, as that covering the sorus of a fern.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A protecting membrane, especially that covering the developing spores of a fern

from the GNU version of the Collaborative International Dictionary of English

  • n. A collection of hairs united so as to form a sort of cup, and inclosing the stigma of a flower.
  • n. The immediate covering of the fruit dots or sori in many ferns, usually a very thin scale attached by the middle or side to a veinlet.
  • n. A peculiar covering found in certain fungi.

from The Century Dictionary and Cyclopedia

  • n. In Roman antiquity, one of the two tunics commonly worn by both men and women, probably the outer tunic, though some arch├Žologists have contended that it was the inner tunic of the women.
  • n. In botany:
  • n. In entomology, the coat or covering of a larval insect, as the case of a caddis-worm.
  • n. In anatomy, the amnion, the innermost membrane enveloping the fetus.
  • n. A layer of gray matter covering the corpus callosum in the brain: also indusium griseum.
  • n. One of the embryonic envelops developed, in addition to the amnion and serosa in certain insects, such as the

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

  • n. a membrane enclosing and protecting the developing spores especially that covering the sori of a fern

Etymologies

Latin, tunic, perhaps alteration of Greek endusis, dress, from enduein, to sink into, put on : en-, in; see en-2 + duein, to sink.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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