Source : Webster's Revised Unabridged Dictionary (1913)

Yuen \Yu"en\, n. (Zo["o]l.)
   The crowned gibbon ({Hylobates pileatus}), native of Siam,
   Southern China, and the Island of Hainan. It is entirely
   arboreal in its habits, and has very long arms. the males are
   dark brown or blackish, with a caplike mass of long dark
   hair, and usually with a white band around the face. The
   females are yellowish white, with a dark spot on the breast
   and another on the crown. Called also {wooyen}, and {wooyen
   ape}.