Entry 1 sense Webster, 1913 Odontocete /(ō̇*dŏn`tō̇*sē"tē̇)/ · O·don·to·ce·te · IPA /oʊˈdɑn(t)əˌsit/ 01 n. pl. A subdivision of Cetacea, including the sperm whale, dolphins, etc.; the toothed whales. 1. A subdivision of Cetacea, including the sperm whale, dolphins, etc.; the toothed whales.(Zool.)