azadirachtin

play
noun azad·i·rach·tin \ ə-ˌza-də-ˈrak-tən \

Definition of azadirachtin

plural azadirachtins
:a chemical compound C35H44O16 that occurs in the seeds of the neem tree (Azadirachta indica) and is used as an insecticide
  • Most of neem's pesticidal punch comes from the compound azadirachtin, which disrupts insects' growth as well as dampening their appetite.
  • —Leslie LandNew York Times10 May 2007
  • Azadirachtin causes hormonal imbalances and disrupts the maturation cycle in insects, which results in unsuccessful molts, or heavily deformed immature insect stages.
  • —Illinois BlasdelLandscape ManagementApril 2005

There's more!

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!
Already a subscriber? Log in.

First Known Use of azadirachtin

1971


Seen and Heard

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

Love words? Need even more definitions?

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

WORD OF THE DAY

a ram's-horn trumpet used in Judaism

Get Word of the Day daily email!

Test Your Vocabulary

Merriam-Webster's New Words Quiz—Fall 2017 Edition!

  • young-plant-shoots
  • Which of the following is a new sense of the word bunny?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
SCRABBLE® Sprint

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

TAKE THE QUIZ

Love words? Need even more definitions?

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