naphthaleneacetic acid

naph·​tha·​lene·​acetic acid

Definition of naphthaleneacetic acid

: either of two crystalline naphthyl derivatives C10H7CH2COOH of acetic acid especially : the alpha or 1-compound used as a growth regulator for plants (as for preventing drop of apples before normal harvest time)

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for naphthaleneacetic acid

naphthalene + acetic

Keep scrolling for more

Learn More about naphthaleneacetic acid

Statistics for naphthaleneacetic acid

Cite this Entry

“Naphthaleneacetic acid.” Dictionary, Merriam-Webster, Accessed 21 Sep. 2020.

Comments on naphthaleneacetic acid

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


Test Your Vocabulary

Homophone Quiz

  • three bears two of them look like theyre whispering to a third bear who looks chuffed to be the center of attention
  • In order to judge how people felt, the senator's office hired a firm to take a ______.
Spell It

Can you spell these 10 commonly misspelled words?


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

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!