/ Dictionary / Index S semitruck: Meaning and Definition of Find definitions for: sem•i•truck Pronunciation: (sem'ē-truk", sem'ī-), [key] — n. tractor-trailer. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. semitropical semivitreous 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