Source : Webster's Revised Unabridged Dictionary (1913)

Landlady \Land"la`dy\, n.; pl. {Landladies}. [Cf. {Landlord}.]
   1. A woman having real estate which she leases to a tenant or
      tenants.

   2. The mistress of an inn or lodging house.

Source : WordNet®

landlady
     n : a landlord who is a woman