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n 1: a central cohesive source of support and stability; "faith is his anchor"; "the keystone of campaign reform was the ban on soft money"; "he is the linchpin of this firm" [syn: {anchor}, {mainstay}, {keystone}, {linchpin}, {lynchpin}]
2: fortitude and determination; "he didn't have the guts to try it" [syn: {grit}, {guts}, {moxie}, {sand}, {gumption}] 3: the series of vertebrae forming the axis of the skeleton and protecting the spinal cord; "the fall broke his back" [syn: {spinal column}, {vertebral column}, {spine}, {back}, {rachis}] 4: the part of a network that connects other networks together; "the backbone is the part of a communication network that carries the heaviest traffic"