semitrailer

/S EH0 M IY0 T R EY1 L ER0/
noun
  1. 1

    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.

  2. 2

    A tractor-trailer or big rig: a semi-trailer plus the truck or tractor pulling it.

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Source: https://en.wiktionary.org/wiki/semi-trailer, https://en.wiktionary.org/wiki/semitrailer