Pyrethrin meaning

pī-rē'thrĭn, -rĕth'rĭn
Either of two viscous liquid esters, C21 H28 O3 or C22 H28 O5 , that are extracted from pyrethrum flowers and used as insecticides.
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Either of two liquid esters, C21H28O3 or C22H28O5, derived from chrysanthemums: the active ingredient of pyrethrum.
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(organic chemistry) Any of a number of naturally occurring insecticides extracted from the pyrethrum plant; unusual in having a cyclopropane ring.
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Origin of pyrethrin

pyrethr(um) –in