But"ton (&?;), n. [OE. boton, botoun, F. bouton button, bud, prop. something pushing out, fr. bouter to push. See Butt an end.] 1. A knob; a small ball; a small, roundish mass.
2. A catch, of various forms and materials, used to fasten together the different parts of dress, by being attached to one part, and passing through a slit, called a buttonhole, in the other; -- used also for ornament.