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ninth chord

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noun Music.
  1. a chord formed by the superposition of four thirds.

Origin of ninth chord

First recorded in 1945–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for ninth chord

ninth chord

noun
  1. a chord much used in jazz and pop, consisting of a major or minor triad with the seventh and ninth added above the rootOften shortened to: ninth
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