say it: BAK-bohn
backbone is a noun meaning "a central cohesive source of support and stability". It carries 5 recorded senses.
fortitude and determination
“he didn't have the guts to try it”
colloquialism
the series of vertebrae forming the axis of the skeleton and protecting the spinal cord
“the fall broke his back”
the part of a network that connects other networks together
“the backbone is the part of a communication network that carries the heaviest traffic”
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for backbone come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.