Source : Webster's Revised Unabridged Dictionary (1913)

Terpsichore \Terp*sich"o*re\, n. [L., fr. Gr. ?; ? enjoyment
   (fr. ? to gladden) + ? dance, dancing.] (Gr. Myth.)
   The Muse who presided over the choral song and the dance,
   especially the latter.

Source : WordNet®

Terpsichore
     n 1: (Greek mythology) the Muse of the dance and of choral song
     2: taking a series of rhythmical steps (and movements) in time
        to music [syn: {dancing}, {dance}, {saltation}]