/ Dictionary / Index D dieb. tert.: Meaning and Definition of Find definitions for: dieb. tert. Pronunciation: [key] (in prescriptions) every third day. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dieb. secund. die cast Related Content Daily Word Quiz: eureka Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language