Learn how to say Naphthalic correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word naphthalene:
[mass noun] Chemistry
a volatile white crystalline compound produced by the distillation of coal tar, used in mothballs and as a raw material for chemical manufacture.
A bicyclic aromatic hydrocarbon; chemical formula: C10H8
Pronunciation: /-ˈθalɪk/ adjective
early 19th century: from naphtha + -ene, with the insertion of -l- for ease of pronunciation