'gearbox' definitions:

Definition of 'gearbox'

(from WordNet)
noun
The shell (metal casing) in which a train of gears is sealed [syn: gearbox, gear box, gear case]

Definition of 'gearbox'

From: GCIDE
  • gearbox \gear"box`\ n. the metal casing in which a train of gears is sealed.
  • Syn: gear case. [WordNet 1.5]