naphthalene
C1Formal / Technical
Definition
Meaning
A white, crystalline, aromatic hydrocarbon (C₁₀H₈) obtained from coal tar, used chiefly in the manufacture of dyes, mothballs, and explosives.
The compound itself, and by extension, mothballs or similar solid pesticides or deodorants made from it.
Linguistics
Semantic Notes
Primarily a technical term in chemistry. In everyday use, it is most commonly encountered in the form of 'naphthalene mothballs', which have a very distinctive, pungent smell.
Dialectal Variation
British vs American Usage
Differences
No significant difference in meaning or usage. Spelling is identical. Pronunciation differs slightly in stress and vowel length.
Connotations
Strongly associated with the smell of mothballs stored with winter clothing. Can have a slightly old-fashioned connotation.
Frequency
Equally low-frequency in everyday speech in both regions, though familiar due to household use of mothballs.
Vocabulary
Collocations
Grammar
Valency Patterns
The [substance] contains naphthalene.Naphthalene is derived from [coal tar].They used naphthalene to protect [the wool].Vocabulary
Synonyms
Strong
Neutral
Weak
Vocabulary
Antonyms
Phrases
Idioms & Phrases
- “The air smelled of naphthalene and old age. (descriptive idiom for attic/storage spaces)”
Usage
Context Usage
Business
Used in manufacturing contexts related to chemicals, dyes, or pest control products.
Academic
Common in chemistry, chemical engineering, and environmental science papers.
Everyday
Almost exclusively used when discussing mothballs or the associated smell. 'It smells like naphthalene in here.'
Technical
Precise term for the specific aromatic hydrocarbon compound, its properties, and industrial applications.
Examples
By Part of Speech
adjective
British English
- The naphthalene residue was difficult to remove.
- A naphthalene-based repellent.
American English
- The naphthalene smell permeated the closet.
- A naphthalene-derived chemical.
Examples
By CEFR Level
- The old sweaters smelled of naphthalene.
- We found some naphthalene mothballs in the attic to protect the woollen blankets.
- Naphthalene's distinctive odour is effective at repelling moths but can be irritating to some people.
- The industrial synthesis of naphthalene from coal tar was a major breakthrough for the dye industry in the 19th century.
Learning
Memory Aids
Mnemonic
Think of a NAPkin in a THALlenge (THALENE). You're trying to remove a stubborn mothball stain from it. The strong smell reminds you it's NAPHTHALENE.
Conceptual Metaphor
A PRESERVATIVE (protects clothes from moths as a preservative protects food from decay).
Watch out
Common Pitfalls
Translation Traps (for Russian speakers)
- Do not confuse with 'нефть' (neft', 'oil/petroleum'). The Russian word is 'нафталин' (naftalin), which is a direct cognate. The primary trap is mispronouncing the 'phth' cluster.
Common Mistakes
- Misspelling: 'naphalene', 'napthalene'.
- Mispronunciation: Not sounding the 'ph' as /f/ or omitting the 'th' sound.
Practice
Quiz
Naphthalene is primarily known in everyday life as the active ingredient in:
FAQ
Frequently Asked Questions
Yes, in high concentrations or if ingested. Naphthalene is toxic and can cause health issues. Modern mothballs often use safer alternatives like paradichlorobenzene.
It has a very strong, pungent, sweet, and tar-like odour that is instantly recognisable as the 'mothball smell'.
No. Naphtha is a broader term for a volatile, flammable liquid hydrocarbon mixture (like petroleum ether). Naphthalene is a specific solid compound (C₁₀H₈) that can be derived from naphtha.
Due to its toxicity and flammability, its use in consumer products like mothballs has declined in favour of less hazardous chemicals. It remains important in industrial chemical synthesis.