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

• spine

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

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, 27 Sep. 2025

Advertisement Jimmy’s quick return is not proof of corporate backbone—massive station groups Sinclair and NexStar are still refusing to air the show. —Lizz Winstead, Time, 27 Sep. 2025

The unit that was supposed to be the backbone of the Miami Dolphins’ 2025 team, the group that vowed to set the table for the entire franchise, is getting spanked on a weekly basis. —Miami Herald, 23 Sep. 2025

Build a domestic chemical backbone that makes your mining, refining, and battery industries more insulated from global shocks. —Kapil Kajal, Interesting Engineering, 23 Sep. 2025

Word History

First Known Use

14th century, in the meaning defined at sense 1

Rhymes for backbone

• alone
• atone
• bemoan
• bluestone
• breastbone
• brownstone
• capstone
• cheekbone
• condone
• curbstone
• cyclone
• dethrone

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)