a sensory organ of lower animals, having a light-perceiving function.
an eyelike spot, as on the tail of a peacock; eye.
Plant Pathology. a disease of plants, characterized by elliptical lesions on the leaves and stems, stunting of growth, and rotting, caused by any of several fungi.

1580–90; eye + spot

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World English Dictionary
eyespot (ˈaɪˌspɒt)
1.  a small area of light-sensitive pigment in some protozoans, algae, and other simple organisms
2.  an eyelike marking, as on the wings of certain butterflies

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
eyespot   (ī'spŏt')  Pronunciation Key 
  1. An area that is sensitive to light and functions somewhat like an eye, found in certain single-celled organisms as well as many invertebrate animals.

  2. A round marking resembling an eye, as on the tail feather of a peacock.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica


a heavily pigmented region in certain one-celled organisms that apparently functions in light reception. The term is also applied to certain light-sensitive cells in the epidermis (skin) of some invertebrate animals (e.g., worms, starfishes).

Learn more about eyespot with a free trial on Britannica.com.

Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
But it was the other invertebrate lineages that would take the simple eyespot and turn it into something incredible.
Sharp eyespot lesions are more superficial and more sharply outlined than those typical of eyespot.
Inheritance of resistance of wheat to eyespot at the adult stage.
Such embryos showed complete rescue of larval eyespot pigmentation.
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