redheadedness en · NOUN
Etymology
From redheaded + -ness; also, by surface analysis, red + headedness.
Meanings
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(uncountable) The trait of having red hair on the head (in humans) or red feathers on the head (in birds).
The finding also suggests that redheadedness would have evolved separately in Neanderthals and humans, at different times and through different genetic variations.
2007 October 30, Henry Fountain, “Neanderthal Bones Make a Case for Redheads”, in New York Times: