Scotland Yard

noun
1.
a short street in central London, England: formerly the site of the London police headquarters, which were removed 1890 to a Thames embankment (New Scotland Yard, ).
2.
the metropolitan police of London, especially the branch engaged in crime detection.
Origin
1860-65
British Dictionary definitions for Scotland Yard

Scotland Yard

noun
1.
the headquarters of the police force of metropolitan London, controlled directly by the British Home Office and hence having certain national responsibilities Official name New Scotland Yard
Word Origin and History for Scotland Yard
n.

used for "London Metropolitan Police," 1864, from the name of short street off Whitehall, London; where from 1829 to 1890 stood the headquarters of the Metropolitan Police Force, hence, the force itself, especially the detective branch. After 1890, located in "New Scotland Yard."