hydrogen cyanide
Low (Specialist/Tech)Technical / Scientific / Forensic
Definition
Meaning
A highly poisonous chemical compound with the formula HCN, existing as a colorless gas or liquid.
A toxic substance used industrially and notorious for its role in chemical warfare and fumigation; its salts (cyanides) are also potent poisons.
Linguistics
Semantic Notes
Often used interchangeably with 'hydrocyanic acid', especially in aqueous solutions. In industrial contexts, may be referred to by its formula, HCN.
Dialectal Variation
British vs American Usage
Differences
No significant lexical differences. Pronunciations differ slightly.
Connotations
Identical strong connotations of extreme toxicity and danger.
Frequency
Equally low-frequency outside of scientific, industrial, or historical contexts.
Vocabulary
Collocations
Grammar
Valency Patterns
[Subj.] releases/produces/contains hydrogen cyanide[Subj.] is exposed to/contaminated with hydrogen cyanide[Subj.] is a source of hydrogen cyanideVocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “None specific to the compound”
Usage
Context Usage
Business
In contexts of industrial chemical production, safety regulations, and liability insurance.
Academic
In chemistry, toxicology, environmental science, and history of warfare texts.
Everyday
Rare. Primarily in news reports about industrial accidents, chemical threats, or true crime.
Technical
Precise discussions of chemical properties, synthesis, detection methods, toxicity mechanisms, and fumigation protocols.
Examples
By Part of Speech
verb
British English
- The material can cyanidise under certain conditions, releasing hydrogen cyanide.
American English
- The process may cyanidize, producing hydrogen cyanide as a byproduct.
adverb
British English
- The gas leaked hydrogen cyanide-laden vapour into the room.
American English
- The area was hydrogen cyanide-contaminated.
adjective
British English
- The hydrogen cyanide concentration was alarmingly high.
American English
- A hydrogen cyanide detector was installed near the storage unit.
Examples
By CEFR Level
- Hydrogen cyanide is a very dangerous poison.
- Workers must wear protective gear when handling hydrogen cyanide.
- The forensic report indicated that the victim had been exposed to hydrogen cyanide gas.
- The industrial synthesis of hydrogen cyanide via the Andrussow process involves the catalytic oxidation of methane-ammonia mixtures.
Learning
Memory Aids
Mnemonic
HYDROGEN CYANIDE: Remember, it's H-C-N (HCN), and Highly Caution Needed.
Conceptual Metaphor
THE SILENT KILLER (invisible, fast-acting poison)
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'cyan' (голубой) or 'cyanate'. The Russian term 'цианистый водород' (tsianistyy vodorod) or 'синильная кислота' (sinil'naya kislota) are direct equivalents.
Common Mistakes
- Misspelling 'cyanide' as 'cianyde' or 'cyanide'.
- Confusing it with other cyanide compounds like potassium cyanide.
- Using 'cyanide' as a shorthand when the specific gaseous/liquid form (HCN) is meant.
Practice
Quiz
Which of the following is a common industrial use for hydrogen cyanide?
FAQ
Frequently Asked Questions
Yes, it is found in small amounts in some plants and fruits, like bitter almonds and apple seeds.
It is often described as having a faint, bitter almond-like odour, but a significant proportion of people cannot smell it due to genetic factors.
It inhibits cytochrome c oxidase in mitochondria, preventing cells from using oxygen, leading to rapid cell death, particularly in the heart and brain.
Yes, treatment kits often contain amyl nitrite, sodium nitrite, and sodium thiosulfate, which help to detoxify cyanide in the body.