Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • adj. Of, relating to, or derived from naphthalene.
  • adj. Relating to phthalic acid.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. of, relating to, or derived from naphthalene or phthalic acid

from the GNU version of the Collaborative International Dictionary of English

  • adj. Pertaining to, or designating, a dibasic acid obtained by the oxidation of naphthalene and allied substances.

from The Century Dictionary and Cyclopedia

  • Derived from naphthalene.

Etymologies

Short for naphthalic acid : naphthal(ene) + -ic.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Shortened form of naphthalic, from naphthalene + -ic, from naphtha + -ene (Wiktionary)

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