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backbone noun

  /ˈbækˌboʊn/ , /ˈbækˌbəʊn/
  • 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.
 σπονδυλική στήλη, ραχοκοκαλιά
  • (figuratively) Any fundamental support, structure, or infrastructure.
 ραχοκοκαλιά
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