Pronunciation: p ī - ' per- ə - ˌ nil-byu ̇ - ' täk- ˌ s ī d, -n ə l-
Function: noun
Etymology: piperon al + -yl + but yl + oxide
Date: 1945
: an insecticide C 19 H 30 O 5 especially : an oily liquid containing this compound that is used chiefly as a synergist (as for pyrethrin insecticides)