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.
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