1
: a usually small spot of color (as on the wing of a butterfly) that resembles an eye
2
a
: a simple visual organ of pigment or pigmented cells covering a sensory termination : ocellus
b
: a small pigmented body of various unicellular algae
3
: any of several fungal diseases of cultivated grasses (such as corn, wheat, and sugarcane) characterized by yellowish oval lesions on the leaves and stem
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Merriam-Webster unabridged
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