[ pahy-ree-thrin, -reth-rin ]
/ paɪˈri θrɪn, -ˈrɛθ rɪn /
Save This Word!
Also called pyrethrin I. a viscous, water-insoluble liquid, C21H28O3, extracted from pyrethrum flowers, used as an insecticide.
Also called pyrethrin II. a like compound, C22H28O5, obtained and used similarly.
QUIZ YOURSELF ON THE 12 TYPES OF VERB TENSES!
Loosen up your grammar muscles because it’s time to test your knowledge on verb tenses!
Question 1 of 6
The verb tenses can be split into which 3 primary categories?
Words nearby pyrethrin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
How to use pyrethrin in a sentence
Although each product has the same effect on insects — and presents the same risks to beneficial insects — pyrethrin usually is more potent and lasts longer.Many companies advertise ‘green’ pest control. But is it possible? And does it work?|Kevin Brasler | Washington Consumers' Checkbook|April 8, 2021|Washington Post
British Dictionary definitions for pyrethrin
/ (paɪˈriːθrɪn) /
Also called: pyrethrin I an oily water-insoluble compound used as an insecticide. Formula: C 21 H 28 O 3
Also called: pyrethrin II a compound of similar chemical structure and action, also found in pyrethrum. Formula: C 22 H 28 O 5
Word Origin for pyrethrin
C19: from pyrethrum + -in
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012