Poilu

un poil (pronounced pwal) = a hair. An expression to know:
à poil = naked (i.e. down to wearing nothing but hair)

poilu / poilu(e) = hairy

Poilu was the nickname of WWI infantrymen, who often wore mustache or beard. In related news, we mourn the death of the penultimate (avant-dernier in French) and oldest surviving poilu, Louis de Cazenave, who passed away at 110 last week-end.