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pyrargyrite
pyrazine
pyrazole
pyre
pyrene (1)
pyrene (2)
Pyrenean
Pyrenees
pyrethrin
pyrethrum
pyretic
Pyrex
pyrexia
pyrheliometer
pyric
pyridine
pyridoxal
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pyrethrin
py·re·thrin [ pī rthrin, pī réthrin ] (plural py·re·thrins)


noun 
Definition:
 
organic compound used as insecticide: either of two oily liquid complex organic compounds. Source: pyrethrum flowers. Use: insecticide. C21H28O3 or C22H28O5
[Early 20th century. <pyrethrum]

py·re·throid [ pī r thròyd ] adjective, noun
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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