氰化 is a verb meaning 'to treat with cyanide' or 'to cyanide', but it almost never appears alone in everyday Chinese — you'll encounter it as part of chemical compound names like 氰化钾 ('potassium cyanide') and 氰化物 ('cyanide compound'). The POS in the source is labelled as verb, whereas the English gloss 'cyanide' is a noun, which creates a mismatch. For HSK 7 learners, the core value is recognizing 氰化 as the root for cyanide-related chemistry terms.