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The eye of most insects and some crustaceans, which is composed of many light-sensitive elements, each having its own refractive system and each forming a portion of an image.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Zoology) the convex eye of insects and some crustaceans, consisting of numerous separate light-sensitive units (ommatidia). See also ocellus
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an eye, typical of insects, composed of many individual light-sensitive units that form a mosaic of images on the retina.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
An eye, as of an insect or crustacean, consisting of hundreds or thousands of tiny light-sensitive parts, with each part creating a portion of an image.
Did You Know? The eyes have it—the important ability to see, that is. But not all eyes are created equal. Insects and other arthropods (which include lobsters and other crustaceans) have compound eyes, which are quite different from ours. The compound eye, greatly magnified, looks like a fencer's mask. It consists of many repeating units, called ommatidia, each of which is a separate light receptor. Some species' eyes have many ommatidia while others have only a few—the more ommatidia an eye has, the better it can resolve images. But even with many ommatidia, the typical compound eye is poor compared with ours at creating a sharp image. A honeybee, for example, sees only one-sixtieth as clearly as we do. However, the compound eye has other special talents. It is excellent at detecting motion, as the moving object passes from one ommatidium to the next. And some insects see ultraviolet light, which is invisible to us.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||compound eye - in insects and some crustaceans: composed of many light-sensitive elements each forming a portion of an image|
ommatidium - any of the numerous small cone-shaped eyes that make up the compound eyes of some arthropods
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