/ Dictionary / Index D daybook: Meaning and Definition of Find definitions for: day•book Pronunciation: (dā'book"), [key] — n. a book in which the transactions of the day are entered in the order of their occurrence. a diary; journal. datebook. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: daybook (Thesaurus) day blindness day boy Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language