Definition of pyrethroid
: any of various synthetic compounds that are related to the pyrethrins and resemble them in insecticidal properties
Recent Examples of pyrethroid from the Web
When pyrethroids were introduced into Israel in the early 1990s, just one treatment would destroy all the adult lice on an individual within a few weeks.
The situation is totally different in Europe, where treatment moved on from pyrethroids and virtually all insecticides about a decade ago, says Ian Burgess, president of the International Society of Phthirapterists (people who study lice).
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Origin and Etymology of pyrethroid
pyrethrin + -oid
First Known Use: 1949See Words from the same year
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