from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. A bitter compound used in adulterating beer.
from the GNU version of the Collaborative International Dictionary of English
- n. A bitter compound used in adulterating beer; bittern.
from The Century Dictionary and Cyclopedia
- n. Same as bittern, 2.
- n. The acquiring by wine of a bitter flavor, due to the formation of brown aldehyde resin or other bitter substance, from age or high temperature.
bitter + -ing? (Wiktionary)