crossbred vs heterologous

crossbred

adj

  • Produced by breeding from two breeds, varieties or species. 

noun

  • Any organism produced by breeding from two breeds, varieties, or species. 

heterologous

adj

  • Of, or relating to different species 

  • Having different relationships or different elements 

How often have the words crossbred and heterologous occurred in a corpus of books? (source: Google Ngram Viewer )