Any of various fungi, principally of the order Agaricales, having fruiting bodies consisting of umbrella-like caps, on stalks, with numerous gills beneath.
1872, Alfred, Lord Tennyson, Idylls of the King, “Gareth and Lynette” in Gareth and Lynette, Etc. London: Strahan & Co., p. 47,
She thereat, as one / That smells a foul-flesh’d agaric in the holt, / And deems it carrion of some woodland thing, / Or shrew, or weasel, nipt her slender nose / With petulant thumb and finger,
A dried fruiting body of a fungus formerly used in medicine (now Laricifomes officinalis, formerly Fomitopsis officinalis, Fomes officinalis, Polyporus officinalis).