There are two distinct words spelled chord: (1) in music, a group of notes sounded together to form the basis of harmony, and (2) a technical word in mathematics and engineering, meaning ‘a straight line joining the ends of an arc, the leading and trailing edges of an aircraft wing, etc’. The idiom to strike a chord derives, somewhat surprisingly, from the technical meaning.
The word cord meaning ‘string, rope, etc’. is used in spinal cord, umbilical cord, vocal cord, etc., The anatomical sense is often spelled chord, particularly in the phrase vocal chords, but this spelling is not recommended.
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