adj. of, or derived from prussic acid; hydrocyanic
the GNU version of the Collaborative International Dictionary of English
adj. designating the acid now called hydrocyanic acid, but formerly called prussic acid, because Prussian blue is derived from it or its compounds. See hydrocyanic.
The Century Dictionary and Cyclopedia
In chem., related to Prussian blue, which was the first cyanogen compound isolated.
Word Usage
"Though we call prussic acid the agent of a person’s death, the whole of the vital and organic properties of the patient are as actively instrumental as the poison, in the chain of effects which so rapidly terminates his sentient existence."