pyrethrin

(redirected from pyrethrin I)
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py·re·thrin

 (pī-rē′thrĭn, -rĕth′rĭn)
n.
Either of two viscous liquid esters, C21H28O3 or C22H28O5, that are extracted from pyrethrum flowers and used as insecticides.

pyrethrin

(paɪˈriːθrɪn)
n
1. (Elements & Compounds) Also called: pyrethrin I an oily water-insoluble compound used as an insecticide. Formula: C21H28O3
2. (Elements & Compounds) Also called: pyrethrin II a compound of similar chemical structure and action, also found in pyrethrum. Formula: C22H28O5
[C19: from pyrethrum + -in]

py•re•thrin

(paɪˈri θrɪn, -ˈrɛθ rɪn)

n.
either of two chemicals, C21H28O3 or C22H28O5, extracted from pyrethrum flowers: used as an insecticide.
[1830–40; pyrethr (um) + -in1]
Translations

pyrethrin

n piretrina
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References in periodicals archive ?
While pyrethrin is by far the safest insecticide, a few critters will still have reactions to it.
"There have been a number of sources that have indicated that pyrethrin is still the drug of choice as the first line of defense against head lice," notes Del Pharmaceuticals Inc.
Pyrethrin is a naturally occurring insecticide derived from chrysanthemums.