bevel gear, pinion and crown wheel, pinion and ring gear - gears that mesh at an angle

cog, sprocket - tooth on the rim of gear wheel

escape wheel - gear that engages a rocking lever

pinion - a gear with a small number of teeth designed to mesh with a larger wheel or rack

epicyclic gear, planet gear, planet wheel, planetary gear - an outer gear that revolves about a central sun gear of an epicyclic train

rack and pinion - a wheel gear (the pinion) meshes with a toothed rack; converts rotary to reciprocating motion (and vice versa)

spur gear, spur wheel - gear wheels that mesh in the same plane

sun gear - the central gear in a epicyclic train

tooth - one of a number of uniform projections on a gear

wheel - a simple machine consisting of a circular frame with spokes (or a solid disc) that can rotate on a shaft or axle (as in vehicles or other machines)

worm gear - gear consisting of a shaft with screw thread (the worm) that meshes with a toothed wheel (the worm wheel); changes the direction of the axis of rotary motion

worm wheel - gear with the thread of a worm

first gear, low gear, low, first - the lowest forward gear ratio in the gear box of a motor vehicle; used to start a car moving

gearset - a set of gears

high gear, high - a forward gear with a gear ratio giving high vehicle velocity for a given engine speed

mechanism - device consisting of a piece of machinery; has moving parts that perform some function

park - a gear position that acts as a parking brake; "the put the car in park and got out"

reverse - the gears by which the motion of a machine can be reversed

second gear, second - the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle; "he had to shift down into second to make the hill"

steering gear - a gear that couples the steering wheel to the steering linkage of a motor vehicle

third gear, third - the third from the lowest forward ratio gear in the gear box of a motor vehicle; "you shouldn't try to start in third gear"

transmission system, transmission - the gears that transmit power from an automobile engine via the driveshaft to the live axle

equipment - an instrumentality needed for an undertaking or to perform a service

fishing gear, fishing rig, fishing tackle, tackle, rig - gear used in fishing

kit, outfit - gear consisting of a set of articles or tools for a specified purpose

regalia - paraphernalia indicative of royalty (or other high office)

rig - gear (including necessary machinery) for a particular enterprise

rigging, tackle - gear consisting of ropes etc. supporting a ship's masts and sails

saddlery, stable gear, tack - gear for a horse

adapt, accommodate - make fit for, or change to suit a new purpose; "Adapt our native cuisine to the available food resources of the new country"

popularise, popularize - make understandable to the general public; "Carl Sagan popularized cosmology in his books"