Noun: ocellus (ocelli) ow'se-lus or u'se-lus
- An eye having a single lens
"Many insects have both compound eyes and ocelli";
- simple eye, stemma
- An eyelike marking (as on the wings of some butterflies); usually a spot of colour inside a ring of another colour
"The butterfly's wings featured prominent ocelli that helped deter predators";
- eyespot
Derived forms: ocelli
Type of: eye, marking, oculus [rare], optic
Encyclopedia: Ocellus