English

interspine

From inter- + spine.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *spey- ‘sharp point’

Proto-Italic *speinā ‘thorn’

Latin spīna ‘thorn’

Old French espine

Middle English spyne ‘a spine’

English spine

Today it means

adj Between spines.

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

Etymograph / interspine