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4WD abbreviation of "four-wheel drive," a car that drives by means of all four wheels rather than the rear wheels only, or the drive system of such, in which both front and rear wheel axles are turned by the drive shaft.
axle a supporting bar or shaft on which, or by means of which, a wheel or wheels turn.
balance wheel a wheel that regulates the movement of parts of a mechanism, as in a watch or a music box.
barrow1 a flat, rectangular frame used for carrying a load, supported by handles at each end or handles at one end and a wheel at the other; wheelbarrow.
bearing a machine part that reduces friction between fixed and moving parts, as in a wheel. [1/5 definitions]
bob3 a buffing or polishing wheel covered with soft material such as felt. [1/3 definitions]
brake1 a device for slowing or stopping the motion of a vehicle, wheel, or the like, esp. by friction. [1/5 definitions]
brake shoe a curved plate of lined metal that creates friction when pressed against a wheel or brake drum, creating a braking action.
buff1 a stick or wheel covered with a soft cloth or piece of leather, used for cleaning or polishing. [2/8 definitions]
cartwheel a sideways somersault with the arms and legs extended like wheel spokes. [2 definitions]
caster a small wheel on a frame attached to the bottom of a heavy object, such as apiece of furniture, to aid in moving it. [1/3 definitions]
cheese a mass of this substance with a specific form, such as a cylinder, wheel, or block. [1/3 definitions]
cogwheel a toothed wheel; gearwheel.
colter the blade or wheel on the front of a plowshare that cuts a line in the sod.
cyclometer an instrument that records the number of revolutions of a wheel or the like. [1/2 definitions]
differential gear an arrangement of gears on the rear axle of an automobile that allows one wheel to turn faster than another during turns.
disk wheel a wheel with a solid disk instead of spokes between hub and rim, used esp. on automobiles.
distaff a staff with one cleft end to hold the material from which thread is drawn in spinning by hand or on a spinning wheel. [1/3 definitions]
drivetrain the assembly that transmits an engine's rotary motion to the actual means of propulsion such as a propeller or wheel.
driving wheel a wheel that transmits power from an engine, either to other wheels, or into propulsive effort, as on a locomotive engine.
eccentric a mechanical device for changing circular motion to back-and-forth motion by means of a wheel with a pivot offset from center. [1/5 definitions]