wheel
     n 1: 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)
     2: a handwheel that is used for steering [syn: {steering wheel}]
     3: a circular helm to control the rudder of a vessel
     4: game equipment consisting of a rotating wheel with slots
        that is used for gambling; players bet on which slot the
        roulette ball will stop in [syn: {roulette wheel}]
     5: an instrument of torture that stretches or disjoints or
        mutilates victims [syn: {rack}]
     6: a wheeled vehicle that has two wheels and is moved by foot
        pedals [syn: {bicycle}, {bike}, {cycle}]
     v 1: change directions as if revolving on a pivot; "They wheeled
          their horses around and left" [syn: {wheel around}]
     2: wheel somebody or something [syn: {wheel around}]
     3: move along on or as if on wheels or a wheeled vehicle; "The
        President's convoy rolled past the crowds" [syn: {roll}]
     4: ride a bicycle [syn: {bicycle}, {cycle}, {bike}, {pedal}]
Source: WordNet® 2.0

wheel n. [from slang `big wheel' for a powerful person] A person who
   has an active {wheel bit}. "We need to find a wheel to unwedge the hung
   tape drives." (See {wedged}, sense 1.) The traditional name of security
   group zero in {BSD} (to which the major system-internal users like
   {root} belong) is `wheel'. Some vendors have expanded on this usage,
   modifying Unix so that only members of group `wheel' can {go root}.


Source: The Jargon File