semitrailer
noun
semi·trail·er
ˈse-ˌmī-ˌtrā-lər 
ˈse-mē-,
-mi-
plural semitrailers
1
: a freight trailer that when attached is supported at its forward end by the fifth wheel device of the truck tractor
2
: a trucking rig made up of a tractor and a semitrailer
called also big rig
Examples of semitrailer in a Sentence
Recent Examples on the Web
The crash involved a semitrailer and two SUVs, one of which rolled.
—
Drake Bentley, jsonline.com, 7 Aug. 2025
The semitrailer truck will begin a yearlong testing phase in September 2025, loading up at Walmart Chile’s Quilicura Distribution Center and carrying out operations and deliveries throughout the greater Santiago metropolitan area.
—IEEE Spectrum, 6 Aug. 2025
The driver of trucks with a gross weight of more than 10,000 pounds, a truck tractor, or a combination of a vehicle and trailer or semitrailer must drive the vehicle only in either of the two lanes farthest to the right, Michigan law says.
—Jalen Williams, Freep.com, 31 July 2025
After hitting the semitrailer, the passenger vehicle left the roadway, rolling several times and striking a traffic light pole before coming to a rest in the southbound lanes of Old Missouri Road, the release states.
—Arkansas Online, 21 July 2025
See All Example Sentences for semitrailer
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Drake Bentley, jsonline.com, 7 Aug. 2025
The semitrailer truck will begin a yearlong testing phase in September 2025, loading up at Walmart Chile’s Quilicura Distribution Center and carrying out operations and deliveries throughout the greater Santiago metropolitan area.
—IEEE Spectrum, 6 Aug. 2025
The driver of trucks with a gross weight of more than 10,000 pounds, a truck tractor, or a combination of a vehicle and trailer or semitrailer must drive the vehicle only in either of the two lanes farthest to the right, Michigan law says.
—Jalen Williams, Freep.com, 31 July 2025
After hitting the semitrailer, the passenger vehicle left the roadway, rolling several times and striking a traffic light pole before coming to a rest in the southbound lanes of Old Missouri Road, the release states.
—Arkansas Online, 21 July 2025
See All Example Sentences for semitrailer
Cite this Entry
“Semitrailer.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/semitrailer. Accessed 20 Aug. 2025.
Copy CitationKids Definition
semitrailer
noun
semi·trail·er
ˈsem-i-ˌtrā-lər
ˈsem-ˌī-
1
: a freight trailer that when attached is supported at its forward end by the truck tractor
2
: a trucking rig made up of a tractor and a semitrailer
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