Ocelli pl. : of Ocellus

Example:
Does an ocellus provide any directional information for an organism?

Taxonomy
ocelli, eyes, dragonfly, dorsal, insects, lens, ocellus, arthropods, compound eyes, Stange, locusts, photoreceptors, median, Bitsch, lens element, insect orders, stemmata, the eye.

Defination from the web: