Hypertext Webster Gateway: "Bitters"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Bitters \Bit"ters\, n. pl.
A liquor, generally spirituous in which a bitter herb, leaf,
or root is steeped.
From WordNet (r) 1.7 (wn)
bitters
n : alcoholic liquor flavored with bitter herbs and roots
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