a knob; a small ball; a small, roundish mass.-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.-a bud; a germ of a plant.-a piece of wood or metal, usually flat and elongated, turning on a nail or screw, to fasten something, as a door.-a globule of metal remaining on an assay cupel or in a crucible, after fusion.-to fasten with a button or buttons; to inclose or make secure with buttons; -- often followed by up.-to dress or clothe.-to be fastened by a button or buttons; as, the coat will not button.