Semi-trailer definition

A trailer without a front axle and with wheels only at the trailing end, designed to be pulled via a pivoting arrangement which also partially supports its weight.
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A tractor-trailer or big rig: a semi-trailer plus the truck or tractor pulling it.
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Other Word Forms

Noun

Singular:
semi-trailer
Plural:
semi-trailers

Origin of semi-trailer

  • semi- +‎ trailer

    From Wiktionary