Definition from Wiktionary, the free dictionary
- Rhymes: -æltəʊ
- (music) The lowest female voice or voice part, higher than tenor and lower than soprano. The terms contralto and alto refer to a similar musical pitch, but among singers, the term contralto is reserved for female singers; the equivalent male form is counter-tenor. Originally the contratenor altus was a high countermelody sung against the tenor or main melody.
Coordinate terms 
- (voice types): soprano, mezzo-soprano, alto, contralto (female); countertenor, tenor, baritone, bass (male)
the lowest female voice
Related terms 
contralto m (plural contralti)