/ Dictionary / Index C card-key: Meaning and Definition of Find definitions for: card-key Pronunciation: (kärd'kē"), [key] — pl. -keys. a small plastic card with magnetic coding that is read electronically when inserted into a scanner and used in place of a key to open locks, hotel doors, etc. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. -cardium cardoon Related Content Daily Word Quiz: pedagogy Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language