Source : Webster's Revised Unabridged Dictionary (1913)

Helicon \Hel"i*con\, n. [L., fr. Gr. ?.]
   A mountain in B[oe]otia, in Greece, supposed by the Greeks to
   be the residence of Apollo and the Muses.

         From Helicon's harmonious springs A thousand rills
         their mazy progress take.                --Gray.

Source : WordNet®

helicon
     n : a tuba that coils over the shoulder of the musician [syn: {bombardon}]