The Collaborative International Dictionary of English v.0.48:

Maundy \Maun"dy\, n. [See Maundy Thursday.]
   1. The sacrament of the Lord's Supper. [Obs.]
      [Webster 1913 Suppl.]

   2. The ceremony of washing the feet of the poor on Maundy
      Thursday.
      [Webster 1913 Suppl.]

   3. The alms distributed in connection with this ceremony or
      on Maundy Thursday.

   Note: In England, the foot washing is obsolete, but the
         "royal maundy" is distributed annually on behalf of the
         sovereign. Since 1890 this distribution has been made
         from Westminster Abbey.
         [Webster 1913 Suppl.] Maundy coins

WordNet (r) 3.0 (2006):

Maundy
    n 1: a public ceremony on Maundy Thursday when the monarch
         distributes Maundy money