a chord formed by the superposition of three thirds.
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How to use seventh chord in a sentence
A note may now be repeated in the lowest part when it becomes the seventh of a dominant seventh-chord.A Treatise on Simple Counterpoint in Forty Lessons | Friedrich J. Lehmann
British Dictionary definitions for seventh chord
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012