Definition of "eye-spot" [eye•-spot]

• A simple visual organ found in many invertebrates, consisting of pigment cells covering a sensory nerve termination. (noun)
• An eyelike spot of color. (noun)

Gnu Collaboartive International Dictionary of English: licensed under The Code Project Open License (CPOL)

• "The orange flashes with their white eye-spot markings on the gatekeeper's wings seem to turn a key in something."
• "When this is completed they are fixed for life: their legs are now converted into prehensile organs; they again obtain a well-constructed mouth; but they have no antennæ, and their two eyes are now reconverted into a minute, single, simple eye-spot."
• "The endoplasm usually, but not always, contains a bright red eye-spot."