English

intergrain

From inter- + grain.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Indo-European *ǵerh₂- ‘to grow old, to mature’

…

Proto-Italic *grānom

Latin grānum ‘seed’

Old French grain

Middle English greyn ‘a grain’

English grain

Today it means

adj Between grains.

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

Etymograph / intergrain