The Collaborative International Dictionary of English v.0.48:

Entellus \En*tel"lus\, n. [NL., the specific name, fr. Gr. ? to
   command.] (Zo["o]l.)
   An East Indian long-tailed bearded monkey (Semnopithecus
   entellus) regarded as sacred by the natives. It is
   remarkable for the caplike arrangement of the hair on the
   head. Called also hoonoomaun and hungoor.
   [1913 Webster]