Old French. sors, *surs, *sours masculine, and surse, sourse, source (modern.French source) fem., substantival uses of the pa. pple. of sourdre to rise or spring . ca.14th century | Old French. sors, *surs, *sours masculine, and surse, sourse, source (modern.French source) fem., substantival uses of the pa. pple. of sourdre to rise or spring . ca.14th century |