English

interdiffuse

From inter- + diffuse.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Latin diffūsus ‘diffused or spread (throughout)’

Middle French diffuser

Today it means

verb To mutually diffuse

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

Etymograph / interdiffuse