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Webster 1913 Edition

Adj.

Of or pertaining to a chord.

chordal ‎(not comparable)

(mathematics, music) Of, pertaining to, or consisting of chords.
(music) Having an accompaniment of chords rather than a countermelody.
(zoology) Having a notochord; chordate
(graph theory) For a graph, in which all cycles of four or more vertices have a chord.

consisting of chords

having an accompaniment of chords

having a notochord

kind of graph