any mushroom of the genus Coprinus, especially C. atramentarius, characterized by gills that disintegrate into blackish liquid after the spores mature.
The Irritating History Of ALL CAPSHow did THIS become code for shouting in the first place? Should we decapitate caps altogether, or is there a place for it in our hearts and on our screens?
Origin of inky cap
First recorded in 1920–25
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019