Definition of backbone
2 : something that resembles a backbone: such asa : a chief mountain ridge, range, or systemb : the foundation or most substantial or sturdiest part of somethingc : the longest chain of atoms or groups of atoms in a usually long molecule (as a polymer or protein)d : the primary high-speed hardware and transmission lines of a telecommunications network (as the Internet)
3 : firm and resolute character
4 : spine 1c
backbonedplay \-ˌbōnd\ adjective
Examples of backbone in a sentence
She is the backbone of the family.
He showed some backbone by refusing to compromise his values.
First Known Use of backbone
BACKBONE Defined for English Language Learners
Definition of backbone for English Language Learners
: the row of connected bones that go down the middle of the back and protect the spinal cord
: the most important or strongest part of something
: strength and courage
BACKBONE Defined for Kids
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