/ Dictionary / Index S Siam: Meaning and Definition of Find definitions for: Si•am Pronunciation: (sī-am', sī'am), [key] — n. former name of(def. 1). Thailand (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: siam (Thesaurus) Sialkot siamang Related Content Daily Word Quiz: eccentric Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language