champignon

noun3

1. •
   Any mushroom of the genus Agaricus.
2. •
   Agaricus bisporus, a species of mushroom commonly used in cooking.

   • Galette of champignon with bacon was a wet puff pastry shell holding overcooked mushrooms and, as far as we could tell, no bacon. — 1978
3. •
   (no longer used) Any mushroom.

   • The Kamtschadales frequently avail themselves, by way of regale, of a venenose species of champignon […] — 1849