The Collaborative International Dictionary of English v.0.48:

Matronize \Mat"ron*ize\, v. t. [imp. & p. p. Matronized; p.
   pr. & vb. n. Matronizing.]
   1. To make a matron of; to make matronlike.
      [1913 Webster]

            Childbed matronizes the giddiest spirits.
                                                  --Richardson.
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   2. To act the part of a matron toward; to superintend; to
      chaperone; as, to matronize an assembly.
      [1913 Webster]