[ 'hɛlɪk(ə)n ]
■ noun a large spiral bass tuba played encircling the player's head and resting on the shoulder.
Origin
C19: from L., assoc. with helix .
HELICON
Meaning of HELICON in English
Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004