gad·wall 
(gădwôl′)
(gădwôl′)n.
A duck (Anas strepera) having gray or brown plumage, widely distributed in the Northern Hemisphere.
[Origin unknown.]
- supergene
- supergiant
- super giant slalom
- supergraphics
- supergravity
- supergun
- superheat
- superheater
- superhelical
- superhelically
- superhelix
- superhero
- superheterodyne
- superhigh frequency
- superhighway
- superhuman
- superhumanity
- superhumanly
- superimposable
- superimpose
- superimposition
- superincumbence
- superincumbency
- superincumbent
- superinduce