'Bosses' definitions:

Definition of 'Bosses'

From: GCIDE

Boss \Boss\ (b[o^]s; 115), n.; pl. Bosses (-[e^]z). [OE. boce, bose, boche, OF. boce, boche, bosse, F. bosse, of G. origin; cf. OHG. b[=o]zo tuft, bunch, OHG. b[=o]zan, MHG. b[^o]zen, to beat. See Beat, and cf. Botch a swelling.]
1. Any protuberant part; a round, swelling part or body; a knoblike process; as, a boss of wood. [1913 Webster]
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. [1913 Webster]
3. (Arch.) A projecting ornament placed at the intersection of the ribs of ceilings, whether vaulted or flat, and in other situations. [1913 Webster]
4. [Cf. D. bus box, Dan. b["o]sse.] 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. [1913 Webster]
5. (Mech.) (a) The enlarged part of a shaft, on which a wheel is keyed, or at the end, where it is coupled to another. (b) A swage or die used for shaping metals. [1913 Webster]
6. A head or reservoir of water. [Obs.] [1913 Webster]

Bosses the projecting parts of a shield (Job 15:26). The Hebrew word thus rendered means anything convex or arched, and hence the back, as of animals.