A cultivated edible mushroom, especially the common button mushroom used in cooking.
From French 'champignon' meaning mushroom, from Old French, ultimately from Latin 'campus' (field) because mushrooms grow in fields. The word came into English through culinary and French cultural influence.
The word 'champignon' literally comes from 'field' in Latin—the French noticed mushrooms growing wild in their fields and named them after where you'd find them, then we adopted their fancy word for the common mushroom!
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