backbone

noun

back·​bone ˈbak-ˈbōn 

-ˌbōn

1

: spinal column, spine

2

: something that resembles a backbone: such as

a

: a chief mountain ridge, range, or system

b

: the foundation or most substantial or sturdiest part of something

c

: the longest chain of atoms or groups of atoms in a usually long molecule (such as a polymer or protein)

d

: the primary high-speed hardware and transmission lines of a telecommunications network (such as the Internet)

3

: firm and resolute character

4

: spine sense 1c

backboned

ˈbak-ˌbōnd 

adjective

Synonyms

• chine
• spinal column
• spine
• vertebral column

Examples of backbone in a Sentence

She is the backbone of the family.

He showed some backbone by refusing to compromise his values.

Recent Examples on the Web

On the other side of the screen, Ukrainians die, lose territory, see apartment blocks reduced to rubble, consider desertion, and watch the backbone of their western support dissolve. —Nick Paton Walsh, CNN, 15 Feb. 2025

The Peychaud’s Bitters, all cherry and anise as opposed to Angostura Bitters’ cinnamon and clove, combines with the herbal pop of absinthe and the spicy backbone of the rye to create something wholly new. —Jeremy Repanich, Robb Report, 7 Feb. 2025

The backbone of last season’s drive to title contention, a 15-match unbeaten run, ended at the hands of these opponents last April. Between New Year’s Day and April 6, nobody in the Championship got the better of Leeds. —Beren Cross, The Athletic, 6 Feb. 2025

And two, cell culture was the backbone of this research field. —Lorena Galliot, Scientific American, 5 Feb. 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1

Kids Definition

backbone

noun

back·​bone -ˈbōn 

-ˌbōn

1

: the skeleton of the trunk and tail of a vertebrate that consists of a jointed series of vertebrae enclosing and protecting the spinal cord

called also spinal column

2

: the foundation or sturdiest part of something

3

: firmness of character

a coward with no backbone

backboned

-ˈbōnd 

-ˌbōnd

adjective

Medical Definition

backbone

noun

back·​bone -ˈbōn, -ˌbōn 

1

: spinal column, spine

2

: the longest chain of atoms or groups of atoms in a usually long molecule (as a polymer or protein)