/ Dictionary / Index T Thompson seedless: Meaning and Definition of Find definitions for: Thomp'son seed'less Pronunciation: [key] a yellow, seedless variety of grape used in producing raisins. the vine bearing this fruit, grown in California. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Thompson Thompson submachine gun Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language