1. [n]  a workman who fulls (cleans and thickens) freshly woven cloth for a living
2. [n]  United States architect who invented the geodesic dome (1895-1983)

1. \Full"er\, n. [AS. fullere, fr. L. fullo. See {Full}, v.
   t.]
   One whose occupation is to full cloth.
   {Fuller's earth}, a variety of clay, used in scouring and
      cleansing cloth, to imbibe grease.
   {Fuller's herb} (Bot.), the soapwort ({Saponaria
      officinalis}), formerly used to remove stains from cloth.
   {Fuller's thistle or weed} (Bot.), the teasel ({Dipsacus
      fullonum}) whose burs are used by fullers in dressing
      cloth. See {Teasel}.
   

2. \Full"er\, n. [From {Full}, a.] (Blacksmith's Work)
   A die; a half-round set hammer, used for forming grooves and
   spreading iron; -- called also a {creaser}.
   

3. \Full"er\, v. t.
   To form a groove or channel in, by a fuller or set hammer;
   as, to fuller a bayonet.
   

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.