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" (Malachi 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.

Noah Webster's New International Dictionary of the English Language

1. (n.) One whose occupation is to full cloth.

2. (n.) A die; a half-round set hammer, used for forming grooves and spreading iron; -- called also a creaser.

3. (v. t.) To form a groove or channel in, by a fuller or set hammer; as, to fuller a bayonet.