Hypertext Webster Gateway: "backbiter"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Backbiter \Back"bit`er\, n.
One who backbites; a secret calumniator or detractor.
From WordNet (r) 1.7 (wn)
backbiter
n : one who attacks the reputation of another by slander or
libel [syn: {defamer}, {maligner}, {slanderer}, {vilifier},
{libeler}, {traducer}]
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