spine

noun

ˈspīn 

1

a

: spinal column

b

: something resembling a spinal column or constituting a central axis or chief support

c

: the part of a book to which the pages are attached and on the cover of which usually appear the title and author's and publisher's names

2

: a stiff pointed plant process

especially : one that is a modified leaf or leaf part compare prickle sense 1, thorn sense 1a

3

: a sharp rigid process on an animal: such as

a

: spicule

b

: a stiff unsegmented fin ray of a fish

c

: a pointed prominence on a bone

spined

ˈspīnd 

adjective

spinelike

ˈspīn-ˌlīk 

adjective

Synonyms

• backbone
• chine
• spinal column
• vertebral column

Examples of spine in a Sentence

This X-ray shows her spine.

Hedgehogs are covered with spines.

They lack the spine to do what needs to be done.

Recent Examples on the Web

For him, the worst parts of his treatment from 2022 to 2023 were the monthly visits for a lumbar puncture, when the medical team would insert a needle into his back to collect cerebrospinal fluid and administer a chemotherapy treatment directly into his spine. —Amy Bizzarri, Chicago Tribune, 5 Apr. 2025

Both men were transported to the hospital and survived the attack, though as of April 2019, Lathan remained in a wheelchair with a bullet lodged in his spine. —Kelsey Lentz, People.com, 31 Mar. 2025

The strange story of what happened to it — and how Tan and her friends Jasmine and Sophie look back on it — forms the spine of this inventive and disarming memoir, which is simultaneously a reminiscence of a rebellious youth, a chronicle of a seat-of-the-pants D.I.Y. film production and a mystery. —Ben Kenigsberg, New York Times, 26 Mar. 2025

Sleep Comfortably The most important part of sleeping with good posture is ensuring your spine is supported in a neutral position. —David Kesselman, Verywell Health, 24 Mar. 2025

Word History

Etymology

Middle English, thorn, spinal column, from Latin spina; perhaps akin to Latin spica ear of grain

First Known Use

15th century, in the meaning defined at sense 1a

Phrases Containing spine

• a chill down your spine
• a chill/shiver runs up/down someone's spine
• make a chill/shiver run up/down someone's spine
• send a chill/shiver up/down someone's spine
• send shivers/chills up (and down) someone's spine
• spine-chilling
• spine-tingling

Rhymes for spine

• brine
• cline
• dine
• fein
• fine
• gwine
• hine
• jain
• klein
• kline
• line
• mine

Kids Definition

spine

noun

ˈspīn 

1

a

: backbone sense 1

b

: something resembling a backbone

c

: the part of a book to which the pages are attached

2

: a stiff pointed usually sharp projecting part of a plant or animal

protective spines cover the body of a porcupine fish

cactus spines are formed from leaves

Etymology

Middle English spine "thorn, spinal column," from Latin spina (same meaning) — related to porcupine

Medical Definition

spine

noun

ˈspīn 

1

: spinal column

2

: a pointed prominence or process (as on a bone)