'agatoid' originates from the Greek word 'agathos,' meaning 'good' or 'noble,' combined with the suffix '-oid,' meaning 'resembling or like.'

'Agathos' transformed into the Latin word 'agathus,' and eventually became the modern English word 'agate,' from which 'agatoid' is derived.

Initially, it meant 'resembling agate,' and this meaning has largely remained the same in modern usage.