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)]
Source: WordNet® 2.0

ocelli
     See {ocellus}
Source: WordNet® 2.0