Simple past tense and past participle of interbreed.(verb)
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Use "interbred" in a sentence
"For a species that's not being deliberately interbred, has a small number of offspring, and reproduces starting at c. age 15 instead of c. age 2, 6000 years is trivial time."
"And now we know that neanderthals interbred only with non-Africans, the people who left Africa ..."
"Some experts believe they interbred with modern humans, others that they were driven to extinction by changing climate or competition for food."