Definition of sesquialtera in English:

sesquialtera

adjective

Music
  • 1[attributive] Relating to or denoting a ratio of 3:2, as in an interval of a fifth.

    1. 1.1 Denoting an organ stop typically consisting of two ranks of narrow-scaled open flue pipes.

Origin

Late Middle English: from Latin, feminine of sesquialter, from sesqui (see sesqui-) + alter second.

Pronunciation:

sesquialtera

/ˌseskwiˈaltərə/