English

interoperculum

From inter- + operculum.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Proto-Italic *opweriō

Latin operiō ‘to cover’

Latin operculum ‘cover, covering’

Today it means

noun interopercle

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

Etymograph / interoperculum