Semitrailer meaning

sĕm'ē-trā'lər, sĕm'ī-
A trailer having a set or several sets of wheels at the rear only, with the forward portion being supported by the truck tractor or towing vehicle.
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A detachable trailer designed to be attached to a coupling at the rear of a tractor, by which it is partly supported.
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Alternative spelling of semi-trailer.
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