See more synonyms for semitrailer on
  1. Also called semi. a detachable trailer for hauling freight, with wheels at the rear end, the forward end being supported by the rear of a truck tractor when attached.Compare full trailer.
  2. tractor-trailer.

Origin of semitrailer

First recorded in 1915–20; semi- + trailer Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words for semitrailer

rig, semi, semitrailer

British Dictionary definitions for semitrailer


  1. a type of trailer or articulated lorry that has wheels only at the rear, the front end being supported by the towing vehicle
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012