Yuen \Yu"en\, n. (Zool.)
   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.
   [1913 Webster]