ˈdīməˌdän noun
or di·me·done -ˌdōn
( -s )
Etymology: International Scientific Vocabulary dime- (from dimethyl ) + d- (from dihydr- ) + -one
: a crystalline diketone C 8 H 12 O 2 made by reaction of mesityl oxide and ethyl malonate and used in the analysis of aldehydes with which it forms insoluble derivatives; 5,5-dimethyl-1,3-cyclohexane-dione