"altos" in the noun sense
1. alto
a singer whose voice lies in the alto clef
2. contralto, alto
the lowest female singing voice
3. countertenor, alto
the highest adult male singing voice
4. alto
of a musical instrument) the second highest instrument in a family of musical instruments
5. alto
the pitch range of the lowest female voice
Source: WordNet® (An amazing lexical database of English)
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