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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.
air shaft a narrow vertical passage through which fresh air can reach an otherwise enclosed area such as the interior of a building; ventilating shaft.
annulet an encircling molding, as around the shaft of a column where it joins the capital.
arbor2 the shaft or axis which turns or supports a rotating cutting tool such as a lathe.
arrow a slender pointed or tipped shaft that is shot from a bow. [1/3 definitions]
axle a supporting bar or shaft on which, or by means of which, a wheel or wheels turn.
ball bearing a bearing composed of a track containing freely rolling metal balls, against which or within which a shaft or other part can rotate without friction. [1/2 definitions]
barrel any of various cylindrical parts, such as the shaft of a gun. [1/6 definitions]
bevel gear a gear with teeth angled or beveled so that it meshes with another gear whose shaft is at an angle of less than 180 degrees to its own shaft.
calamus the hollow shaft of a feather; quill. [1/3 definitions]
camshaft an engine shaft having one or more cams.
collar anything that encircles a cylindrical object, such as a restraining ring around a shaft in a machine. [1/7 definitions]
column a vertical shaft or pillar that helps support a building. [1/5 definitions]
countershaft an intermediate shaft that transmits motion from a motor to a machine driven by it; jackshaft.
cowl a hoodlike cover on a chimney or ventilator shaft, used to increase draft. [1/6 definitions]
crank a mechanical device for applying rotary motion, consisting of a lever arm or disk attached at right angles to the end of a rotating shaft and turned by hand or connecting rod. [2/6 definitions]
crankshaft a shaft that turns or is turned by one or more cranks that are attached to or part of the shaft.
diaphysis the shaft or middle part of a long bone.
drill1 a tool consisting of a shaft that has sharp cutting edges and is used to make holes in wood, metal, or the like, usu. by means of rotation; drill bit. [2/12 definitions]
drive shaft a rotating shaft that transmits torque, as in some automobiles from the transmission to the rear axle.
elevator a machine which raises or lifts, esp. a platform or enclosure in a vertical shaft, with its equipment and parts, used to raise and lower people or goods from one level to another in a building. [1/3 definitions]