The Collaborative International Dictionary of English v.0.48:

Quell \Quell\, v. i. [imp. & p. p. Quelled; p. pr. & vb. n.
   Quelling.] [See Quail to cower.]
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   1. To die. [Obs.]
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            Yet he did quake and quaver, like to quell.
                                                  --Spenser.
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   2. To be subdued or abated; to yield; to abate. [R.]
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            Winter's wrath begins to quell.       --Spenser.
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WordNet (r) 3.0 (2006):

quelled
    adj 1: subdued or overcome; "the quelled rebellion"; "an
           uprising quenched almost before it started"; "a squelched
           rumor" [syn: quelled, quenched, squelched]