Noun gear wheel has 1 sense
  1. gear, gear wheel, cogwheel - a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion
    --1 is a kind of wheel
    --1 has parts: cog, sprocket; tooth
    --1 has particulars:
     bevel gear, pinion and crown wheel, pinion and ring gear; escape wheel; pinion; planetary gear, epicyclic gear, planet wheel, planet gear; rack and pinion; spur gear, spur wheel; sun gear; worm gear; worm wheel
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