Dictionary
sem•i•trail•er
Pronunciation: (sem'i-trā"lur), [key]—
n.
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. Cf.
full trailer.
2. tractor-trailer.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.