a smooth, edible, large white-capped mushroom, Agaricus arvensis, that has the odor of anise, common in North American meadows and fields.
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Origin of horse mushroom
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
British Dictionary definitions for horse mushroom
a large edible agaricaceous field mushroom, Agaricus arvensis, with a white cap and greyish gills
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012