noun Genetics.
the increase in growth, size, fecundity, function, yield, or other characters in hybrids over those of the parents.
Also called hybrid vigor.

1910–15; < Late Greek hetérōsis an alteration. See hetero-, -sis

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World English Dictionary
heterosis (ˌhɛtəˈrəʊsɪs)
biology another name for hybrid vigour
[C19: from Late Greek: alteration, from Greek heteroioun to alter, from heteros other, different]

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Example sentences for heterosis
Maize was the first species where heterosis was widely used to produce hybrids.
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