Definitions
1.nounA forked bone between the neck and breast of a bird consisting chiefly of the two clavicles fused at their median or lower end, regarded as a lucky charm in some countries.
2.nounA spar in two parts, between which a sail is hoisted, the wishbone extending its clew.
3.nounAny sailing vessel rigged with a wishbone.
4.nounA particular kind of offensive formation. See wishbone formation.