English

intertester

From inter- + tester.

Proto-Indo-European *h₁én ‘in’

Proto-Indo-European *h₁entér ‘between’

Proto-Italic *n̥ter ‘between’

Latin inter ‘between’

Latin testura

Old French testre

Middle English tester

Today it means

adj Between testers.

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

Etymograph / intertester