from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An insecticide, C10Cl12, used especially against ants.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The pesticide and fire retardant perchloropentacyclodecane that is a persistent, bioaccumulative, and toxic pollutant
Perhaps (pis)mir(e) + ex(terminate).(American Heritage® Dictionary of the English Language, Fourth Edition)