1. Any figure in the shape of a cross formed by two intersecting lines.
Synonym: crux of heart.
3. a method of hybridization or the hybrid so produced.
Origin: f. Croix, L. Crux
breed animals or plants using parents of different races and varieties; cross a horse and a donkey; Mendel tried crossbreeding; these species do not interbreed.An organism that is the offspring of genetically dissimilar parents or stock; especially offspring produced by breeding plants or animals of different varieties or breeds or species; ”a mule is a cross between a horse and a donkey.