/ Dictionary / Index S sirenian: Meaning and Definition of Find definitions for: si•re•ni•an Pronunciation: (sī-rē'nē-un), [key] — n. an aquatic, herbivorous mammal of the order Sirenia, including the manatee and dugong. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sirenian (Thesaurus) Sirena sirenic Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language