A person who attests or bears witness to something, officially confirming its authenticity or truth.
From Latin attestari (to bear witness) + -ator (one who does). The root attests comes from ad- (to) + testari (to witness, from testis meaning witness).
The word testis (witness) is actually the root of both 'attest' and 'testis' (the body part)—because in ancient Rome, male witnesses were crucial, and the word literally means 'the one who stands by' as a third party.
Complete word intelligence in one call. Free tier — 50 lookups/day.