a large edible agaricaceous field mushroom, Agaricus arvensis, with a white cap and greyish gills
horse mushroom in American English
noun
a smooth, edible, large white-capped mushroom, Agaricus arvensis, that has the odor of anise, common in North American meadows and fields
Word origin
[1865–70]This word is first recorded in the period 1865–70. Other words that entered Englishat around the same time include: black belt, maverick, springboard, steamroller, valence