sickener
nounEtymology From sicken + -er.
1
One who, or that which, sickens.
- We had been knocked out of the FA Cup by Gravesend, which was a real sickener for me.2010, Steve Wignall, You Can Have Chips:
2
A small, bright red and possibly poisonous russula or brittlegill (Russula emetica).