Definitions

from The Century Dictionary.

  • noun One of the rudimentary sensory organs of many low animals which have been supposed to have a visual function. See eye, and cut under Balanoglossus.
  • noun The rudiment of an eye in the embryo of higher animals.
  • noun An ocellus.
  • noun In certain unicellular algæ, as Volvox, a (usually) reddish spot thought to resemble an eye in position and appearance.
  • noun An ocellated or eye-like spot, as those on the tail of a peacock.
  • noun Same as eyehole, 3.

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

  • noun A simple visual organ found in many invertebrates, consisting of pigment cells covering a sensory nerve termination.
  • noun An eyelike spot of color.

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

  • noun an eyelike marking (as on the wings of some butterflies); usually a spot of color inside a ring of another color

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