fuller

n. [ AS. fullere, fr. L. fullo. See Full, v. t. ] One whose occupation is to full cloth. [ 1913 Webster ]

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
Fuller's weed (Bot.), the teasel (Dipsacus fullonum) whose burs are used by fullers in dressing cloth. See Teasel. [ 1913 Webster ]

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. [ 1913 Webster ]

v. t. To form a groove or channel in, by a fuller or set hammer; as, to fuller a bayonet. [ 1913 Webster ]