/ Dictionary / Index S Socinus: Meaning and Definition of Find definitions for: So•ci•nus Pronunciation: (sō-sī'nus), [key] (Fausto Sozzini), 1539–1604, and his uncle,(Lelio Sozzini), 1525–62, Italian Protestant theologians and reformers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: socinus (Thesaurus) Socinian socio- Related Content Daily Word Quiz: soporific Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language