• (n.) The act or process of imparting a luster, as to pottery. • (p. pr. & vb. n.) of Lustre • (n.) The brightening of a metal in the crucible when it becomes pure, as in certain refining processes.
Lus'ter·ing noun 1. The act or process of imparting a luster, as to pottery. 2. The brightening of a metal in the crucible when it becomes pure, as in certain refining processes. 
the treatment of fabrics by chemical or mechanical means in order to increase their property to reflect light.