WordReference Random House Unabridged Dictionary of American English © 2025
tetraeth′yl pyrophos′phate, [Chem.]
  1. Chemistrya colorless to amber, hygroscopic, poisonous liquid, (C2H5)4P2O7, used as an insecticide and as a rodenticide. Also called TEPP 

'tetraethyl pyrophosphate' also found in these entries (note: many are not synonyms or translations):
TEPP

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