Definition of haymarket:
(n) :
Any of various placenames, particularly a street in the City of Westminster, London, and the Theatre Royal Haymarket in that street.
(n) :
An inner city area of Newcastle upon Tyne, Tyne and Wear, England (OS grid ref NZ2464).
(n) :
An inner city area of Edinburgh, Scotland (OS grid ref NT2473).
(n) :
An inner suburb of the City of Sydney, New South Wales, Australia.
(n) :
A town in Prince William County, Virginia.
(n) :
(historical) A market that sells hay as animal fodder.