-ˌlōn noun
( -s )
Etymology: pinacol + -one
1. : a liquid ketone (CH 3 ) 3 COCH 3 of peppermint odor formed from pinacol by treatment with acid to cause loss of water and molecular rearrangement; 3,3-dimethyl-2-butanone
2. : any of a series of ketones R 3 CCOR formed like pinacolone from other pinacols