(of smells) sharp; bitter; pungent; harsh
The burning plastic sent up an acrid smoke that made us all cough violently.
acer acris (sharp, pungent, bitter, eager, fierce) (Latin)
remove "r" from acrid, so now it becomes acid and acid is always bitter in taste and when smelt its pungent too sounds like ACID. all acids are bitterly pungent and corrosive