weldv. t. To wield.(Chaucer.)n.[OE. welde; akin to Scot. wald, Prov. G. waude, G. wau, Dan. & Sw. vau, D. wouw.]()1. (Bot.) An herb (Reseda luteola) related to mignonette, growing in Europe, and to some extent in America; dyer's broom; dyer's rocket; dyer's weed; wild woad. It is used by dyers to give a yellow color.()2. Coloring matter or dye extracted from this plant.()v. t.[Probably originally the same word as well to spring up, to gush; perhaps from the Scand.; cf. Sw. vlla to weld, uppvlla to boil up, to spring up, Dan. vlde to gush, G. wellen to weld. See Well to spring.]()1. To press or beat into intimate and permanent union, as two pieces of iron when heated almost to fusion.()()2. Fig.: To unite closely or intimately.()Two women faster welded in one love. (Tennyson.)n. The state of being welded; the joint made by welding.()Butt weld. See under Butt. -- Scarf weld, a joint made by overlapping, and welding together, the scarfed ends of two pieces.()