diacetyl
adjective
di·ace·tyl
| \ ˌdī-ə-ˈsēt-ᵊl
, dī-ˈas-ət-ᵊl
\
, dī-ˈas-ət-ᵊl
\
Medical Definition of diacetyl
(Entry 1 of 2)
: containing two acetyl groups
diacetyl
nounMedical Definition of diacetyl (Entry 2 of 2)
: a greenish yellow liquid compound (CH3CO)2 that has an odor like that of quinone, that is chiefly responsible for the odor of butter and contributes to the aroma of coffee and tobacco, and that is used as a flavoring agent in foods (as margarine)
— called also biacetyl