"semis" in the noun sense
1. semifinal, semi
one of the two competitions in the next to the last round of an elimination tournament
2. trailer truck, tractor trailer, trucking rig, rig, articulated lorry, semi
a truck consisting of a tractor and trailer together
3. semitrailer, semi
a trailer having wheels only in the rear the front is supported by the towing vehicle
Source: WordNet® (An amazing lexical database of English)
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