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An edible mushroom, especially the much cultivated species Agaricus bisporus.
[French, alteration of Old French champigneul, probably from Vulgar Latin *(fungus) campiniolus, (fungus) growing in the fields, from Late Latin campānia, countryside; see campaign.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Plants) any of various agaricaceous edible mushrooms, esp Marasmius oreades and the meadow mushroom. See also fairy ring
[C16: from French, perhaps from Vulgar Latin campīnus (unattested) of the field, from Latin campus plain, field]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
cham•pi•gnon(ʃæmˈpɪn yən, ˌʃæm pɪnˈyɔ̃)
n., pl. -pi•gnons (-ˈpɪn yənz, -pɪnˈyɔ̃)
an edible mushroom.
[1570–80; < Middle French, appar. « Vulgar Latin *campīn(us) of the field (see camp1, -ine1) + French -on n. suffix]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.