ocellus

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ocellus

(pl. ocelli): see eyeeye,
organ of vision and light perception. In humans the eye is of the camera type, with an iris diaphragm and variable focusing, or accommodation. Other types of eye are the simple eye, found in many invertebrates, and the compound eye, found in insects and many other
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ocellus

[ō′sel·əs]
(invertebrate zoology)
A small, simple invertebrate eye composed of photoreceptor cells and pigment cells.
(petrology)
A phenocryst in an ocellar rock.