backbone

1. 1

   The series of vertebrae, separated by disks, that encloses and protects the spinal cord, and runs down the middle of the back in vertebrate animals.countable

2. 2

   Any fundamental support, structure, or infrastructure.countablefiguratively

   • Before automobiles, railroads were a backbone of commerce.
3. 3

   Courage, fortitude, or strength.figurativelyuncountable

   • He would make a good manager, if he had a little more backbone.

syn. spine · spinal column · vertebral column · backbone