GNU Collaborative International Dictionary of English

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1.       
   ‖Ocellus (?), 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]