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.
Bibliography Information Easton, Matthew George. M.A., D.D., "Biblical Meaning for 'fuller' Eastons Bible Dictionary". bible-history.com - Eastons; 1897.