English

interspinous

From inter- + spinous.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *spey- ‘long, thin, sharp’

Proto-Italic *speinā ‘thorn’

Latin spīna ‘thorn’

Latin spinōsus ‘thorny, prickly’

Today it means

adj Interspinal.

Language periods are conventional ranges, not dates for this word.

Etymograph / interspinous