The Collaborative International Dictionary of English v.0.48:

Hymn \Hymn\, v. t. [imp. & p. p. Hymned; p. pr. & vb. n.
   Hymning.] [Cf. L. hymnire, Gr. ?.]
   To praise in song; to worship or extol by singing hymns; to
   sing.
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         To hymn the bright of the Lord.          --Keble.
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         Their praise is hymned by loftier harps than mine.
                                                  --Byron.
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The Collaborative International Dictionary of English v.0.48:

Hymning \Hymn"ing\, a.
   Praising with hymns; singing. "The hymning choir." --G. West.
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The Collaborative International Dictionary of English v.0.48:

Hymning \Hymn"ing\, n.
   The singing of hymns. --Milton.
   [1913 Webster]