alto
alto noun, adjectiveBrE /ˈæltəʊ/
NAmE /ˈæltoʊ/
noun(pl. altos) 1 (also con•tralto) [countable] a singing voice with a lower range than that of a soprano; a person with an alto voice 2 [singular] a musical part that is written for an alto voice 
word origin
compare baritone, bass, countertenor, tenor adjective[only before noun] (of a musical instrument) with the second highest range of notes in its group word origin
an alto saxophone compare soprano, tenor
