Definitions

1. adjective

relating to or denoting prussic acid (hydrogen cyanide)

“The prussic acid in the plant made it highly toxic to animals.”

2. noun

a former name for hydrogen cyanide

“In the past, people used prussic acid as a fumigant.”

3. noun

a former name for potassium ferrocyanide

“The chemist isolated the prussic from the plant’s leaves.”