Fuller

The word "full" is from the Anglo-Saxon fullian, meaning "to
whiten." To full is to press or scour cloth in a mill. This art
is one of great antiquity. Mention is made of "fuller's soap"
(Mal. 3:2), and of "the fuller's field" (2 Kings 18:17). At his
transfiguration our Lord's rainment is said to have been white
"so as no fuller on earth could white them" (Mark 9:3). En-rogel
(q.v.), meaning literally "foot-fountain," has been interpreted
as the "fuller's fountain," because there the fullers trod the
cloth with their feet.