pyrethrin ii

pyrethrin

[pahy-ree-thrin, -reth-rin]
noun Chemistry.
1.
Also called pyrethrin I. a viscous, water-insoluble liquid, C 2 1 H 2 8 O 3 , extracted from pyrethrum flowers, used as an insecticide.
2.
Also called pyrethrin II. a like compound, C 2 2 H 2 8 O 5 , obtained and used similarly.

Origin:
1830–40; pyrethr(um) + -in2

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

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