a branched-chain primary butyl alcohol C4H11O synthetically made usually from carbon monoxide and hydrogen
isobutyl
noun(iso-bu-tyl)
butyl nitrite
isobutyl
noun(iso-bu-tyl)
a colorless pungent liquid C4H9NO2 inhaled by drug users for its stimulating effects which are similar to those of amyl nitrite —called also isobutyl nitrite