Alto

Al·to

Alto

n.

pl. Altos

  1. Formerly the part sung by the highest male, or counter-tenor, voices; now the part sung by the lowest female, or contralto, voices, between in tenor and soprano. In instrumental music it now signifies the tenor. (Mus.)
  2. An alto singer.

Phrases & Compounds
Alto clef
the counter-tenor clef, or the C clef, placed so that the two strokes include the middle line of the staff.