[W/K] :: ocellus

  Ocellus \O*cel"lus\, n.; pl. Ocelli. [L., dim. of oculus an
     eye.] (Zool.)
        (a) A little eye; a minute simple eye found in many
            invertebrates.
        (b) An eyelike spot of color, as those on the tail of the
            peacock.
            [1913 Webster]

  ocellus
       n 1: an eye having a single lens [syn: simple eye, stemma]
       2: an eyelike marking (as on the wings of some butterflies);
          usually a spot of color inside a ring of another color
          [syn: eyespot]
       [also: ocelli (pl)]