gearbox

from WordNet (r) 3.0 (2006)
gearbox
    n 1: the shell (metal casing) in which a train of gears is
         sealed [syn: {gearbox}, {gear box}, {gear case}]
    
from The Collaborative International Dictionary of English v.0.48
gearbox \gear"box`\ n.
   the metal casing in which a train of gears is sealed.

   Syn: gear case.
        [WordNet 1.5]
    

[email protected]