noun
: an acetic ester CH 3 COOC 5 H 11 of pentyl alcohol: as
a. : the ester obtained from a commercial amyl alcohol as a water-insoluble liquid with a strong fruity odor and used as a solvent (as for cellulose nitrate lacquers) and in artificial fruit essences and perfumes — called also banana oil, pear oil
b. : isoamyl acetate