\Maun"dy Thurs"day\ [OE. maunde a command, OF. mand['e], L. mandatum, from mandare to command. See called from the ancient custom of washing the feet of the poor on this day, which was taken to be the fulfillment of the ``new commandment,'' --John xiii. 5, 34.] (Eccl.) The Thursday in Passion week, or next before Good Friday.