gear box

Noun
  1. The shell (metal casing) in which a train of gears is sealed (synset 103436480)
    is a type of: case, casing, shell - the housing or outer covering of something
    has: transmission shaft - rotating shaft that transmits rotary motion from the engine to the differential
    is a part of: transmission, transmission system - the gears that transmit power from an automobile engine via the driveshaft to the live axle
    same as: gear case, gearbox

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