Stentor
Webster's Dictionary [1]
(1): ( n.) 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.
(2): ( n.) A howling monkey, or howler.
(3): ( n.) A herald, in the Iliad, who had a very loud voice; hence, any person having a powerful voice.
Cyclopedia of Biblical, Theological and Ecclesiastical Literature [2]
a Grecian warrior in the army against Troy, whose voice was louder than the combined voices of fifty other men. His name has accordingly furnished an adjective which, in common use, describes a voice of unusual volume. It is said that Juno assumed the form of Stentor in order to encourage the disheartened Greeks (Iliad, 5, 785 sq.; Juven. Sat. 13, 112).
The Nuttall Encyclopedia [3]
A Grecian herald who accompanied the Greeks in the Trojan War, and whom Homer describes as "the great-hearted, brazen-voiced Stentor, whose shout was as loud as that of fifty other men," hence the epithet stentorian.