IPA: //ˈnæfθəˌliːn//
KK: /ˈnæfθəˌlin/
A white solid substance made from coal tar or petroleum, often used to make dyes, moth repellents, and explosives.
The mothballs in the closet contained naphthalene to keep the insects away.
Naphthalene is derived from the Greek "naphtha" (meaning a type of oil or liquid) and the suffix "-ene" (indicating a hydrocarbon compound). The word refers to a specific type of hydrocarbon derived from coal tar, which is oily in nature.
Think of 'naphtha' as a type of oil, and remember that 'naphthalene' is a compound that comes from this oily substance.