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ocellus

o·cel·lus [ ō sélləss ] (plural o·cel·li [ ō sé l ])


noun 
Definition:
 
1. insects simple eye in invertebrates: a simple eye in some insects and other invertebrates that is sensitive to light but unable to focus clearly

2. birds eye-shaped spot on feathers: an eye-shaped spot on the feathers of some birds such as peacocks

3. botany eye-shaped spot on leaf: an enlarged discolored eye-shaped spot on a leaf

4. fish eye-shaped spot on fish: an eye-shaped spot on a fish, usually dark-ringed with a lighter color inside, believed to deceive predators

[Early 19th century. < Latin, "small eye" < oculus "eye"]
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