1. a sensory organ of lower animals, having a light-perceiving function.
  2. an eyelike spot, as on the tail of a peacock; eye.
  3. 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.

Origin of eyespot

First recorded in 1580–90; eye + spot
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for eyespot

Historical Examples of eyespot

British Dictionary definitions for eyespot


  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 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

eyespot in Science


  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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.