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Biology Similarity of external form or appearance but not of structure or origin.
(noun)
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Zoology A resemblance in form between the immature and adult stages of an animal.
(noun)
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Mathematics A transformation of one set into another that preserves in the second set the operations between the members of the first set.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.