a smooth, edible, large white-capped mushroom, Agaricus arvensis, that has the odor of anise, common in North American meadows and fields.
Origin of horse mushroom
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
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