'agaric' originates from Greek, specifically the word 'agarikon,' where 'agarikon' referred to a type of tree fungus.

'agarikon' transformed into the Latin word 'agaricum,' and eventually became the modern English word 'agaric' through Old French.

Initially, it referred to a specific type of tree fungus, but over time it evolved to include a broader category of fungi with similar characteristics.