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The Collaborative International Dictionary
Superdominant

Superdominant \Su`per*dom"i*nant\, n. (Mus.) The sixth tone of the scale; that next above the dominant; -- called also submediant.

Wiktionary
superdominant

a. (context botany English) (rfdef: English) n. (context music English) The sixth tone of the scale, immediately above the dominant.