Meaning of alto clarinet in English:

alto clarinet

noun

Music
  • A clarinet between a soprano and bass in size, usually pitched in E flat, and having a range between G in the second octave below middle C and the middle of the second octave above it.

    Also called tenor clarinet, although the latter is more commonly used to mean an instrument pitched in F.

Origin

Mid 19th century; earliest use found in Harmonicon.