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pyrethrin
(redirected from Pyrethrins)

    Also found in: Medical, Encyclopedia, Wikipedia 0.01 sec.
py·re·thrin  (p-rthrn, -rthrn)
n.
Either of two viscous liquid esters, C21H28O3 or C22H28O5, that are extracted from pyrethrum flowers and used as insecticides.
[pyrethr(um) + -in.]
pyrethrin [paɪˈriːθrɪn]
n
1. (Chemistry / Elements & Compounds) Also called pyrethrin I an oily water-insoluble compound used as an insecticide. Formula: C21H28O3
2. (Chemistry / Elements & Compounds) Also called pyrethrin II a compound of similar chemical structure and action, also found in pyrethrum. Formula: C22H28O5
[from pyrethrum + -in]


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