Wiktionary
sickener
n. 1 One who, or that which, sickens. 2 A small, bright red and possibly poisonous russula or brittlegill, ''Russula emetica''.
Usage examples of "sickener".
A BOY: Arsenic or poisonous mushrooms: death cup, sickener, jack-o'lantern, fly agaric, Satan's boletus?