/ Dictionary / Index S SIG: Meaning and Definition of Find definitions for: SIG Pronunciation: [key] special-interest group. Sig. Pronunciation: [key] (in prescriptions) write; mark; label: indicating directions to be written on a package or label for the use of the patient. let it be written. signor. signore; signori. sig. Pronunciation: [key] signal. signature. signor. signore; signori. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. siftings siganid 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