1) Fungus genus 2) Genus agaricus 3) Type genus of agaricaceae 
Agaricus is a genus of mushrooms containing both edible and poisonous species, with possibly over 300 members worldwide. The genus includes the common (`button`) mushroom (Agaricus bisporus) and the field mushroom (Agaricus campestris), the dominant cultivated mushrooms of the West. Members of Agaricus are characterized by having a fleshy cap or.....
A basidiomycetous fungal genus of the family agaricaceae, order agaricales, which includes the field mushroom (a. Campestris) and the commercial mushroom (a. Bisporus). ... (12 Dec 1998) ... 
Type: Term Pronunciation: ă-gar′i-kŭs Definitions: 1. A large genus of mushrooms many of which are edible and others poisonous.
[n] - type genus of Agaricaceae
Agaricus A genus of gilled fungi of the order Agaricales.
genus Agaricus noun type genus of Agaricaceae; gill fungi having brown spores and including several edible species
any mushroom of the genus Agaricus, comprising the meadow mushrooms and a commercially grown species, A. brunnescens.