alto
noun [ C ] uk/ˈæl.təʊ/ us/ˈæl.toʊ/ altos
女低音（歌手）;男童低音（歌手）
(a woman with) a low adult female singing voice or (a boy with) the lowest boys' singing voice or (a man with) the highest adult male singing voice
She began by singing soprano, then changed to alto. 她开始时唱女高音，后来改唱女低音。
Compare: contraltocountertenor
alto
adjective uk/ˈæl.təʊ/ us/ˈæl.toʊ/
（乐器）中音的
used to refer to a musical instrument that is of a size and range between soprano and tenor
an alto saxophone/flute 中音萨克斯管／长笛