from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. See hybrid vigor.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The tendency of cross-breeding to produce an animal or plant with a greater hardiness than its parents; hybrid vigour

from the GNU version of the Collaborative International Dictionary of English

  • n. A figure of speech by which one form of a noun, verb, or pronoun, and the like, is used for another, as in the sentence: “What is life to such as me?”

from The Century Dictionary and Cyclopedia

  • n. In grammar and rhetoric, same as enallage.

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

  • n. (genetics) the tendency of a crossbred organism to have qualities superior to those of either parent


Late Greek heterōsis, alteration, alteration of Greek heteroiōsis, from heteroioun, to alter, from heteroios, different in kind, from heteros, other; see hetero-.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From hetero- + -osis (Wiktionary)



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