/ Dictionary / Index S source book: Meaning and Definition of Find definitions for: source' book" Pronunciation: [key] an original writing, as a document, record, or diary, that supplies an authoritative basis for future writing, study, evaluation, etc. a volume containing a small collection of such writings, usually on a specific subject, used in research. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. source source code Related Content Daily Word Quiz: neologism Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language