/ Dictionary / Index C CST: Meaning and Definition of Find definitions for: CST Pronunciation: [key] Central Standard Time. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: cst (Thesaurus) C-SPAN C star 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