The Collaborative International Dictionary of English v.0.48:

Dowagerism \Dow"a*ger*ism\, n.
   The rank or condition of a dowager; formality, as that of a
   dowager. Also used figuratively.
   [1913 Webster]

         Mansions that have passed away into dowagerism.
                                                  --Thackeray.
   [1913 Webster]