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n. pl. en·to·zo·a (-zō′ə)
Any of various animals, such as tapeworms or trematodes, that inhabit the internal organs or tissues of other animals, usually as parasites.
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.