pyrethroid From WikiWord, the free dictionary English Contents DefinitionsRelated wordsReferences DefinitionsnounAny of several synthetic insecticides having a structure based on pyrethrin. Related wordsSynonymsinsecticidespyrethrinpyrethrumpyrethrozinepyrethrinecyanopyrethroidphenylpyrazolephenylpyrrolepyrimidopteridinepyrenolpyrromethenepyrenylenechloropyridinepyranonearylpyrrolidinedipyrrin References Wiktionary — pyrethroid Wikipedia — pyrethroid