The Collaborative International Dictionary of English v.0.48:

Vertu \Ver"tu\, n.
   1. Virtue; power. See Virtue. [Obs.] --Chaucer.
      [1913 Webster]

   2. See Virtu.
      [1913 Webster]

WordNet (r) 3.0 (2006):

vertu
    n 1: love of or taste for fine objects of art [syn: virtu,
         vertu, connoisseurship]
    2: artistic quality [syn: virtu, vertu]