/ Dictionary / Index S Sylvanus: Meaning and Definition of Find definitions for: Syl•va•nus Pronunciation: (sil-vā'nus), [key] — pl. -ni Silvanus. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: sylvanus (Thesaurus) sylvanite sylvatic 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