Weld Or Woald. A plant cultivated in many parts of this kingdom, for its yellow colouring matter. Two sorts of weld are distinguished, the bastard or wild, which grows naturally in the fields; and the cultivated, the stalks of which are smaller and not so high. The latter is preferred for dyeing, abounding more in colouring matter. When the plant has arrived at maturity the stalks are pulled, made into bundles and dried, in which state it is used. To give a permanent yellow to wool by weld, mordants become necessary; but when prepared with alum and tartar, it takes a very durable and fine yellow.