stentorPronunciation: /ˈstɛntə/Definition of stentor noun 1 literary a person with a powerful voice. 2 Zoology a sedentary trumpet-shaped single-celled animal that is widespread in fresh water. Genus Stentor, phylum Ciliophora, kingdom Protista Origin: early 17th century: from Greek Stentōr, the name of a herald in the Trojan Warstentor in other Oxford dictionaries Definition of stentor in the US English dictionary