1. a large trailer without a front axle, designed to be pulled by a truck tractor

Examples

• The truck driver backed the semitrailer up to the loading dock.
• A fully loaded semitrailer can weigh up to 80,000 pounds.
• The company ordered three new semitrailers to expand their shipping capacity.
• Ice formed on the semitrailer’s roof during the overnight trip.
• The semitrailer jackknifed on the icy highway.
• Workers loaded boxes of merchandise into the semitrailer.