1. [ noun ] (informal) fortitude and determination
Synonyms: guts gumption sand moxie grit

"he didn't have the guts to try it"

Related terms: fortitude colloquialism
2. [ noun ] a central cohesive source of support and stability
Synonyms: anchor lynchpin linchpin keystone mainstay

"faith is his anchor" "the keystone of campaign reform was the ban on soft money" "he is the linchpin of this firm"

Related terms: support anchor
3. [ noun ] (anatomy,zoology) the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
Synonyms: spine vertebral_column back rachis spinal_column

"the fall broke his back"

Related terms: skeletal_structure notochord chine axial_skeleton vertebra coccyx intervertebral_disc spinal_canal
4. [ noun ] (computer science) the part of a network that connects other networks together

"the backbone is the part of a communication network that carries the heaviest traffic"

Related terms: connection computer_network network
Similar spelling:   backbend