Definition of "semi-trailer" [semi-trailer]

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

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• "He looks out the window at the semi-trailer trucks whizzing by on the highway."
• "A semi-trailer parked outside Town Hall is filling up with donated water, clothing, household goods and food."
• "The typical semi-trailer truck guzzles 20,000 gallons of diesel annually and uses the same roads day after day."