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The Collaborative International Dictionary
Rhytina

Rhytina \Rhyt"i*na\, n. (Zo["o]l.) See Rytina.

Rhytina

Rytina \Ryt"i*na\, n. [NL., fr. Gr. "ryti`s a wrinkle.] (Zo["o]l.) A genus of large edentulous sirenians, allied to the dugong and manatee, including but one species ( Rytina Stelleri); -- called also Steller's sea cow, stellerine and steller. [Written also Rhytina.]

Note: It is now extinct, but was formerly abundant at Bering's Island, near Bering's Straits. It was twenty-five feet or more in length, with a thick, blackish, naked skin. The last were killed in 1768 for their oil and flesh.

Wiktionary
rhytina

n. Steller's sea cow (''Hydrodamalis gigas''), a large herbivorous marine mammal.