What is "fuller's herb"

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

n. The soapwort (''Saponaria officinalis''), formerly used to remove stains from cloth.