18-wheeler
English
Alternative forms
Etymology
From the total number of wheels: two front steering wheels on the tractor, plus dual wheels on each end of two axles (total of 8) at the rear of the tractor and supporting the front of the trailer, plus dual wheels on two axles at the rear of the trailer.
Noun
18-wheeler (plural 18-wheelers)
- A big rig truck: a semi-trailer plus the truck or tractor pulling it.
Synonyms
See also
1. tractor; tractor unit
2. semi-trailer (detachable)
3. engine compartment
4. cabin
5. sleeper (not present in all trucks)
6. air dam
7. fuel tanks
8. fifth wheel coupling
9. enclosed cargo space
10. landing gear - legs for when semi-trailer is detached