polychlorinated naphthalene

== English == === Pronunciation === (US) IPA(key): /ˌpoʊliˌklɔrəˌneɪtəd ˌnæfˈθæliːn/ (UK) IPA(key): /ˌpɒlɪˌklɔːrɪneɪtɪd ˌnæfˈθæliːn/ === Noun === polychlorinated naphthalene (plural polychlorinated naphthalenes, abbreviation PCN) (organic chemistry) Any of a range of compounds manufactured by treating naphthalene with chlorine; they have a variety of properties and uses.