Quantcast
Merriam-Webster Logo
  • Dictionary
  • Thesaurus
  • Scrabble
  • Spanish Central
  • Learner's Dictionary

naphthol

play
noun naph·thol \ˈnaf-ˌthȯl, ÷ˈnap-, -ˌthōl\

Definition of naphthol

  1. 1 :  either of two isomeric derivatives C10H8O of naphthalene used as antiseptics and in the manufacture of dyes

  2. 2 :  any of various hydroxy derivatives of naphthalene that resemble the simpler phenols



Origin and Etymology of naphthol

International Scientific Vocabulary


First Known Use: 1849


Medical Dictionary

naphthol

play play
noun naph·thol \ˈnaf-ˌthȯl, ˈnap-, -ˌthōl\

Medical Definition of naphthol

  1. :  either of two isomeric derivatives C10H8O of naphthalene found in coal tar or made synthetically:a:  one used chiefly in synthesizing dyes—called also alpha-naphtholb:  one used chiefly as an intermediate (as for dyes and pharmaceuticals) and especially formerly in medicine as an antiseptic and parasiticide—called also beta-naphthol




Learn More about naphthol


Seen and Heard

What made you want to look up naphthol? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

a secret group of plotters

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

dog-eating-apple

Which is a synonym of asperse?

beat divulge defame placate
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
SCRABBLE® Sprint

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ