Eighteen-wheeler definitions

ā'tēn-wē'lər, -hwē'-
A combination of a tractor and a semitrailer; a tractor-trailer rig.
noun
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A tractor-trailer having eighteen wheels.
noun
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A tractor-trailer with eighteen wheels, normally with two steerable wheels on the first axle and four wheels on two fixed axles of the tractor and two fixed four-wheel axles on the rear of the trailer.
noun
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