Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

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

from the GNU version of the Collaborative International Dictionary of English.

  • noun A collection of hairs united so as to form a sort of cup, and inclosing the stigma of a flower.
  • noun 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.
  • noun A peculiar covering found in certain fungi.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

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

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

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

Etymologies

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

[Latin, tunic, perhaps alteration of Greek endusis, dress, from enduein, to sink into, put on : en-, in; see en– + duein, to sink.]

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