noun
or oe·nan·thal·de·hyde ˌēˌnanˈthaldəˌhīd
Etymology: International Scientific Vocabulary enanth-, oenanth- (as in enanthic acid ) + aldehyde
: a pungent oily compound CH 3 (CH 2 ) 5 CHO obtained by pyrolysis of castor oil and used especially in making artificial cognac — called also heptaldehyde, heptanal