Obs. [a. Du. krap, MDu. crappe, whence also Ger. and Sw. krapp, Da. krap, F. crappe (1513 from Lille in Godef.).] Madder; esp. the commercial product obtained by grinding the inner part of the root.
1721. C. King, Brit. Merch., I. 185. Crap Madder from 1676 to 1679, 46 s. a 64 s. per Ct. wt.
1762. trans. Busching’s Syst. Geog., V. 626. In some tracts [are cultivated] the herbs for dying, as crap, woad, and clary.
1812. J. Smyth, Pract. Customs, 133. The finest sort [of madder], which is of a bright reddish colour, is called Crop.
