Source : Webster's Revised Unabridged Dictionary (1913)

Stentor \Sten"tor\, n. [L. Stentor, Gr. ?.]
   1. A herald, in the Iliad, who had a very loud voice; hence,
      any person having a powerful voice.

   2. (Zo["o]l.) Any species of ciliated Infusoria belonging to
      the genus {Stentor} and allied genera, common in fresh
      water. The stentors have a bell-shaped, or
      cornucopia-like, body with a circle of cilia around the
      spiral terminal disk. See Illust. under {Heterotricha}.

   3. (Zo["o]l.) A howling monkey, or howler.

Source : WordNet®

stentor
     n 1: a speaker with an unusually laoud voice
     2: the mythical Greek warrior with an unusually loud voice who
        died after losing a shouting contest with Hermes
     3: any of several trumpet-shaped ciliate protozoans that are
        members of the genus Stentor