boss

boss is a   Noun

Definition:

[1] Any protuberant part; a round, swelling part or body; a knoblike process; as, a boss of wood.

[2] 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.

[3] A projecting ornament placed at the intersection of the ribs of ceilings, whether vaulted or flat, and in other situations.

[4] 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. Gwilt.

[5] The enlarged part of a shaft, on which a wheel is keyed, or at the end, where it is coupled to another.

[6] A swage or die used for shaping metals.

[7] A head or reservoir of water. [Obs.]

Synonyms: