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Agnus Dei
ago
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agog
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agonise, etc
agonist
agonistic
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agonist

ag·o·nist [ ággənist ] (plural ag·o·nists)


noun 
Definition:
 
1. competitor: somebody involved in a struggle, contest, or competition with somebody else ( formal )

2. anatomy muscle acting against another: a muscle whose action is balanced by that of another associated muscle

3. biochemistry drug mimicking bodily chemical: a hormone, neurotransmitter, or drug that triggers a response by binding to specific cell receptors

[Early 17th century. < Greek agōnistēs "contestant, actor" < agōn "contest"]
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