pīˈperəˌnal, pə̇ˈp-; ˈpipər- noun
( -s )
Etymology: International Scientific Vocabulary piper ine + -one + -al
: a crystalline aldehyde (CH 2 O 2 )C 6 H 3 CHO that has an odor like that of the heliotrope, that is obtained usually by oxidation of piperic acid or isosafrole, and that is used chiefly in perfumery, cosmetics, and soaps; 3,4-methylenedioxy-benzaldehyde — called also heliotropin