What does crossbreeding mean?
Crossbreeding is the practice of deliberately mating organisms from different breeds, varieties, or strains — usually within the same species — to produce offspring that combine desirable traits from both parents. It is central to agriculture and animal husbandry: farmers crossbreed cattle for higher milk yields, dogs for temperament and working ability, and crops for disease resistance or improved flavor. The term functions primarily as a noun denoting both the process itself and, less commonly, the hybrid offspring that result. Unlike inbreeding, which narrows genetic diversity by mating close relatives, crossbreeding broadens it, often producing hybrid vigor, or heterosis, where offspring outperform either parent line. The word appears most often in technical, farming, and scientific contexts but is widely understood in general usage. Its neutral, practical tone makes it the standard choice over emotionally charged alternatives when discussing controlled breeding programs.
The process of mating or hybridizing organisms of different breeds, varieties, or species to produce offspring with desired characteristics.
"Crossbreeding revolutionized corn production across the American Midwest in the twentieth century."
Typically uncountable when referring to the process; occasionally countable when referring to individual instances of crossing.
Hybrid offspring produced by such mating, considered collectively.
"The herd consisted mainly of first-generation crossbreeding between Friesian and Jersey stock."
This sense is rarer than the process sense; speakers more often say 'a crossbreed' or 'a hybrid' for an individual offspring.
Rarely used in the plural; the word almost always functions as a singular mass noun referring to the process. A plural would sound awkward in most contexts.
"Such crossbreedings were documented in the breeder's notebooks over several decades."
Nearly every modern crop and livestock breed you eat — from seedless grapes to Angus-style beef — owes its existence to centuries of deliberate crossbreeding long before anyone understood genetics.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of crossbreeding
The word combines 'cross', from Old Norse 'kross', ultimately from Latin 'crux' meaning stake or gibbet, with 'breeding', from Old English 'brēdan', meaning to produce or hatch young. The compound emerged in English during the 19th century as systematic livestock improvement became a major scientific and commercial enterprise, alongside related terms like crossbreed and crossbred. Cognates sharing the Latin root 'crux' include crucial, crucifixion, and crux itself, all carrying the core sense of something that crosses or is decisive.
Related word forms
How crossbreeding is actually used
Mostly used in agricultural, horticultural, zoological, and scientific registers; it is neutral in connotation, though 'mongrelization' carries pejorative overtones that 'crossbreeding' avoids. In genetics literature, 'hybridization' is often preferred when distinct species are involved, while 'crossbreeding' typically implies different breeds or varieties within the same species.
Easily confused with crossbreeding
Inbreeding is the mating of closely related individuals of the same breed, whereas crossbreeding deliberately mates unrelated breeds or varieties to increase genetic diversity.
Grafting joins plant tissues physically without sexual reproduction, while crossbreeding produces new offspring through fertilization.