Definition of heterosis in English English dictionary
The tendency of cross-breeding to produce an animal or plant with a greater hardiness than its parents; hybrid vigour
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?
or hybrid vigor Increase in such characteristics as size, growth rate, fertility, and yield of a hybrid organism over those of its parents. Plant and animal breeders exploit heterosis by mating two different purebred lines that have desirable traits. The first-generation offspring generally show, in greater measure, the desired characteristics of both parents. Since this vigour may decrease if the hybrids are actually mated together, the parental lines must be maintained and crossed for each new crop or group desired