'amidase' originates from the word 'amide,' which is derived from the French word 'amide,' meaning a compound derived from ammonia by replacement of one or more hydrogen atoms by acyl groups.

'amide' transformed from the French word 'amide' and eventually became the modern English word 'amide,' which is part of 'amidase.'

Initially, 'amide' referred to a specific type of chemical compound, and this meaning has largely remained the same in modern usage.