n. - Any protuberant part; a round, swelling part or body; a knoblike process; as, a boss of wood.
n. - A protuberant ornament on any work, either of different material from that of the work or of the same, as upon a buckler or bridle; a stud; a knob; the central projection of a shield. See Umbilicus.
n. - A projecting ornament placed at the intersection of the ribs of ceilings, whether vaulted or flat, and in other situations.
n. - A wooden vessel for the mortar used in tiling or masonry, hung by a hook from the laths, or from the rounds of a ladder.
n. - The enlarged part of a shaft, on which a wheel is keyed, or at the end, where it is coupled to another.
n. - A swage or die used for shaping metals.
n. - A head or reservoir of water.
v. t. - To ornament with bosses; to stud.
n. - A master workman or superintendent; a director or manager; a political dictator.