From WordNet (r) 2.0 (August 2003) [wn]:
geartrain
n : wheelwork consisting of a connected set of rotating gears by
which force is transmitted or motion or torque is
changed; "the fool got his tie caught in the geartrain"
[syn: gearing, gears, power train, train]
From The Collaborative International Dictionary of English v.0.48 [gcide]:
geartrain \gear"train`\ n.
a connected set of rotating gears by which force is
transmitted or motion or torque is changed.
Syn: gearing, gears, power train, train.
[WordNet 1.5]