compound eye

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun A visual organ found in arthropods such as insects and crustaceans. It consists of one to thousands of tiny independent photoreception units.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun in insects and some crustaceans: composed of many light-sensitive elements each forming a portion of an image