Cro-magnon \Cro-magnon\ prop. n. 1. a race of human-like hominids of the Upper Paleolithic in Europe, considered of the same species as modern humans ({Homo sapiens}). Their skeletal remains were found mostly in southern France. [WordNet 1.5 +PJC] 2. a member of the Cro-Magnon race. [PJC]