Source : Webster's Revised Unabridged Dictionary (1913)

Erato \Er"a*to\, n. [L., fr. Gr. ?, fr. ? to love.] (Class.
   Myth.)
   The Muse who presided over lyric and amatory poetry.

Source : WordNet®

Erato
     n : (Greek mythology) the Muse of lyric and love poetry