From curdle + -er.
curdler (plural curdlers)
- That which curdles.
1975, Gaye Horsley, Gaye Deamer, Commercial Foods Exposed!: And How to Replace Them!, page 47:Salt is known to be a curdler of milk but the amount necessary to curdle it, [sic] makes the cheese unpalatable.
- (slang) An acoustic weapon used to disperse crowds.