Also found in: Thesaurus, Encyclopedia.
alto-(word root) high
Examples of words with the root alto-: altostratus
high: altocumulus; altostratus.
[from Latin altus high]
n., pl. -tos,
3. the second highest part of a four-part chorus.
4. the second highest instrument in a family of musical instruments.adj.
5. of, pertaining to, or having the range of an alto.
[1775–85; < Italian < Latin altus high]
var. of alti-: altostratus.