noun, plural cham·pi·gnons [sham-pin-yuh nz or, esp. British, cham-; French shahn-pee-nyawn] /ʃæmˈpɪn yənz or, esp. British, tʃæm-; French ʃɑ̃ piˈnyɔ̃/.
- any of various agaricaceous edible mushrooms, esp Marasmius oreades and the meadow mushroomSee also fairy ring
“mushroom,” 1570s, from Middle French champignon (14c.), with change of suffix, from Old French champegnuel, from Vulgar Latin *campaniolus “that which grows in the field,” from Late Latin campaneus “pertaining to the fields,” from campania “level country” (see campaign (n.)).