ナフタリンナフタリンMeanings1nounnaphthalenechemistryA white crystalline hydrocarbon used in mothballs and chemical synthesis. The term ナフタレン is also used synonymously.from German NaphthalinSee also: ナフタレンナフタリンは防ぼう虫ちゅう剤ざいとして使つかわれる。Naphthalene is used as a moth repellent.