sub-band1
/ˈsʌbband/noun
A subdivision of a band of North American Indians.
Origin
Early 19th century; earliest use found in Zebulon Pike (1779–1813), soldier and explorer. From sub- + band.
sub-band2
/ˈsʌbband/noun
A band or layer (especially a band of frequencies or wavelengths) that forms part of a larger band.
Origin
Late 19th century; earliest use found in Proceedings of the Royal Society of London. From sub- + band.