hel·i·con 
(hĕlĭ-kŏn′, -kən)
(hĕlĭ-kŏn′, -kən)n.
A large spiral brass tuba, such as a sousaphone, that fits around the player's shoulder.
[Probably from Greek helix, helik-, spiral.]
- cardinalate
- cardinal flower
- cardinal number
- cardinal point
- cardinalship
- cardinal virtue
- cardio
- cardio-
- cardioacceleration
- cardioaccelerator
- cardiogenic
- cardiogram
- cardiograph
- cardiography
- cardioid
- cardiolipin
- cardiological
- cardiologist
- cardiology
- somniferous
- somniferously
- somnific
- somniloquist
- somniloquy
- somnolence