Webster's English Dictionary

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backbone

Cross references:
  1. fortitude             
 
back.bone \-'bo-n, -.bo-n\ n 1: SPINAL COLUMN, SPINE  2a: a chief mountain 
   ridge, range, or system  2b: the foundation or most substantial or 
   sturdiest part of something  3: firm and resolute character  4: the back of 
   a book usu. lettered with the title and the author's and pub lisher's names