What is the definition for this word Homo neanderthalensis

The defenition exactly one is cave man or literally out of my dictionary! Informal, unenlightened, primitive, culturally or intellectu ally backward! also Homo is a Latin word meaning "Human" or "man". The wordneanderthalensis is based on the location where the first najor specimen.

The definition for it is cave man or literally out of my dictionary Informal. primitive, unenlightened, or reactionary; culturally or intellectually backward. also of or relating to Nearnerthal man