Source : Webster's Revised Unabridged Dictionary (1913)

Peeress \Peer"ess\, n.
   The wife of a peer; a woman ennobled in her own right, or by
   right of marriage.

Source : WordNet®

peeress
     n : a woman of the peerage in Britain [syn: {Lady}, {noblewoman}]
         [ant: {Lord}, {Lord}]