The Collaborative International Dictionary of English v.0.48:

Chord \Chord\, v. t. [imp. & p. p. Chorded; p. pr. & vb. n.
   Chording.]
   To provide with musical chords or strings; to string; to
   tune.
   [1913 Webster]

         When Jubal struck the chorded shell.     --Dryden.
   [1913 Webster]

         Even the solitary old pine tree chords his harp.
                                                  --Beecher.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chord \Chord\, v. i. (Mus.)
   To accord; to harmonize together; as, this note chords with
   that.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Chord \Chord\ (k[^o]rd), n. [L chorda a gut, a string made of a
   gut, Gr. chordh`. In the sense of a string or small rope, in
   general, it is written cord. See Cord.]
   1. The string of a musical instrument. --Milton.
      [1913 Webster]

   2. (Mus.) A combination of tones simultaneously performed,
      producing more or less perfect harmony, as, the common
      chord.
      [1913 Webster]

   3. (Geom.) A right line uniting the extremities of the arc of
      a circle or curve.
      [1913 Webster]

   4. (Anat.) A cord. See Cord, n., 4.
      [1913 Webster]

   5. (Engin.) The upper or lower part of a truss, usually
      horizontal, resisting compression or tension. --Waddell.
      [1913 Webster]

   Accidental, Common, & Vocal chords. See under
      Accidental, Common, and Vocal.

   Chord of an arch. See Illust. of Arch.

   Chord of curvature, a chord drawn from any point of a
      curve, in the circle of curvature for that point.

   Scale of chords. See Scale.
      [1913 Webster]

WordNet (r) 3.0 (2006):

chord
    n 1: a straight line connecting two points on a curve
    2: a combination of three or more notes that blend harmoniously
       when sounded together
    v 1: play chords on (a string instrument)
    2: bring into consonance, harmony, or accord while making music
       or singing [syn: harmonize, harmonise, chord]

Moby Thesaurus II by Grady Ward, 1.0:

98 Moby Thesaurus words for "chord":
   accompany, accord, air line, arpeggio, assonate, atone, attune,
   axis, be harmonious, be in tune, beeline, blend, broken chord,
   caring, catgut, chime, common chord, concento, concern, concertize,
   concord, consonant chord, diagonal, diameter,
   diminished seventh chord, direct line, directrix, do,
   dominant chord, echo, edge, empathy, enharmonic, execute,
   fellow feeling, fiddlestring, great-circle course, harmonize,
   horsehair, identification, interpret, involvement, major triad,
   make music, melodize, minor chord, musicalize, normal,
   nylon string, pathos, perform, perpendicular, play, play by ear,
   put in tune, radius, radius vector, relating, render, response,
   responsiveness, right line, secant, segment, seventh chord,
   sharing, shortcut, side, sixth chord, sound in tune,
   sound together, steel string, straight, straight course,
   straight line, straight stretch, straightaway, streamline, string,
   sympathetic chord, sympathetic response, sympathy, symphonize,
   synchronize, tangent, tone down, tone up, tonic triad, transversal,
   triad, tune, tune up, unbroken chord, vector, vibes, vibrations,
   voice, wound string