half-track or half|track «HAF TRAK, HAHF-», noun.
1. a type of motor vehicle having wheels in the front for steering, and caterpillar tracks at the rear for driving power, used especially in the armed forces for mounting heavy weapons and carrying troops.
2. the track at the rear of such a vehicle.
3. Electronics. a method of recording on magnetic tape, using two half-width tracks on a single tape and thus doubling its capacity.
Useful english dictionary. 2012.