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The Collaborative International Dictionary of English v.0.48 (gcide)

taxicab \tax"i*cab\, n.
an automobile with a professional driver which can be hired
to carry passengers; -- also called a {taxi}, and informally
called a {cab} or a {hack}. The driver of a taxicab is
referred to as a {cab driver} or {cabbie}, and sometimes as a
{chauffeur} or {hackie}.

Note: Taxicabs may be engaged by a prior appointment made,
e.g. by telephone, or they may cruise for passengers,
i.e. they may drive in city streets and stop to pick up
pasengers when they are signalled by a prospective
passenger. The act of signalling a taxicab (usually by
a wave of the arm) is often called

{to hail a cab} or

{to flag down a cab}.
[PJC]