acetoin
/əˈsiːtəʊɪn/ /ˈasɪtəʊɪn/Chemistry
noun
A pale yellow to colourless liquid which solidifies just below room temperature and which gives butter its characteristic aroma.
- Systematic name: 3-hydroxybutan-2-one; CH3C(O)CH(OH)CH3..
Origin
Early 20th century. From aceto- + -in, after benzoin.