helicon

名词 helicon:

1. a tuba that coils over the shoulder of the musician
   同义词：bombardon

hel.i.con

n.Music （名词）【音乐】
A large spiral brass tuba that fits around the player`s shoulder.
海力空大号，圈形大号：由演奏者掮在其肩上吹奏的大型螺旋状铜号

来源：
Probably from Greek helix, helik- [spiral]
可能源自 希腊语 helix, helik- [螺旋]