heterosis

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heterosis

 [het″er-o´sis]
the existence, in the first generation hybrid, of greater vigor than is shown by either parent.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

het·er·o·sis

(het'ĕr-ō'sis),
The beneficial effect on the phenotype of crossing (hybridization) on growth, vigor, and physical or mental qualities in a strain of plants or in animal stock, as measured by the difference between the midparent mean phenotype and that of F1; also referred to as hybrid vigor.
[hetero- + -ōsis, condition]
Farlex Partner Medical Dictionary © Farlex 2012

heterosis

(hĕt′ə-rō′sĭs)
het′er·ot′ic (-rŏt′ĭk) adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

heterosis

or

hybrid vigour

the superiority of a HYBRID produced from crossing two different types of parent with one or more inferior characteristics. For example, two different inbred lines of cereals when crossed together can produce hybrids with a far higher yield and general vigour than either parental line.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005