Source : Webster's Revised Unabridged Dictionary (1913)

Rookery \Rook"er*y\, n.; pl. {Rookeries}.
   1. The breeding place of a colony of rooks; also, the birds
      themselves. --Tennyson.

   2. A breeding place of other gregarious birds, as of herons,
      penguins, etc.

   3. The breeding ground of seals, esp. of the fur seals.

   4. A dilapidated building with many rooms and occupants; a
      cluster of dilapidated or mean buildings.

   5. A brothel. [Low]