Hypertext Webster Gateway: "opposer"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Opposer \Op*pos"er\, n.
One who opposes; an opponent; an antagonist; an adversary.
From WordNet (r) 1.7 (wn)
opposer
n : someone who offers opposition [syn: {adversary}, {antagonist},
{opponent}, {resister}]
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