1) Alto 1) Band instrument 2) Brasses member 3) Cornet relative 4) Relative of a cornet 
• (n.) An instrument of the saxhorn family, used exclusively in military music, often replacing the French horn.
Alt'horn` noun [ Alt + horn .] (Mus.) An instrument of the saxhorn family, used exclusively in military music, often replacing the French horn. Grove. 
The althorn is a musical instrument of the saxhorn family, used exclusively in military music, often replacing the French horn.
a valved brass musical instrument, varying in shape, that is the alto member of the cornet family. Also called