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permethrin

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per·meth·rin   (pər-měth'rĭn)   
n.  A topical insecticide, C21H20CL2O3, used to treat head lice and nits, scabies, and various species of ticks.

[per- + (res)methrin, a pyrethroid (resm-, of unknown origin + (pyr)ethrin).]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: per·meth·rin
Pronunciation: p&r-'meth-r&n
Function: noun
: a synthetic pyrethroid pesticideC21H20Cl2O3 used especially against insects, ticks, and mites
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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