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Definition of: sirenian
(sī·rē′nē·ən) noun
One of an order (Sirenia) of aquatic mammals, including the manatee, dugong, etc., of somewhat fishlike form with the lower jaw as in ordinary mammals, and having mostly molariform teeth for a herbivorous diet.
—adjective Of or pertaining to the Sirenia. [<NL Sirenia, name of the order <L siren. See SIREN.]
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