semi-tractor

listen to the pronunciation of semi-tractor
Английский Язык - Английский Язык
The engine, operator's cabin, and hitch, together called the tractor, of a "semi-tractor trailer", comprising the forward part, which tows a trailer hitched thereto; a "semi" , a trailer truck, a tractor trailer, an eighteen wheeler. Sometimes two and as many as three trailers may be towed. The trailer often is enclosed, refrigerated, etc