18-wheeler Definition
noun
A big rig truck: a semi-trailer plus the truck or tractor pulling it.
Wiktionary
Other Word Forms of 18-wheeler
Noun
Singular:
18-wheeler
Plural:
18-wheelersOrigin of 18-wheeler
From the total number of wheels: two front steering wheels on the tractor, plus dual wheels on each end of two axles (total of 8) at the rear of the tractor and supporting the front of the trailer, plus dual wheels on two axles at the rear of the trailer.
From Wiktionary
