The Collaborative International Dictionary of English v.0.48:
Chordal \Chor"dal\, a. Of or pertaining to a chord. [1913 Webster] chordamesodermWordNet (r) 3.0 (2006):
chordal adj 1: relating to or consisting of or emphasizing chords; "chordal assonance in modern music"; "chordal rather than contrapuntal music"