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“stentor”
1. The mythical Greek warrior with an unusually loud voice who died after losing a shouting contest with Hermes.
Stentor was said to have a voice "as loud as that of fifty other men together".
2. A speaker with an unusually resonant or thundering voice.
A unit related to:
“stentor”
(Greek: Greek herald in the Trojan war [Greek mythology]; powerful voice [literally, "groaner, roarer"])