Definitions for "Hybrid vigor"
an increase in the performance of hybrids over that of purebreds, most noticeably in traits such as fertility and survivability.
Increased vigor or growth associated with a combination of two dissimilar parents. Caused by the masking of deleterious recessive alleles or the positive interaction of two dissimilar alleles at the same locus.
The increased growth or production exhibited by the first generation over the average of its two parent breeds. It is usually expressed as a percentage.
Keywords:  overdominance
increased size or fitness of a hybrid, generally a results of its heterozygosity.