[attrib.](Music)relating to or denoting a ratio of 3:2, as in an interval of a fifth (乐)黑米奥拉比例;三比二 ■denoting a mixture stop in an organ, typically consisting of two ranks of narrow-scaled open flue pipes 西斯基阿尔特拉音栓
语源
late Middle English: from Latin, feminine of sesquialter, from sesqui (see sesqui-) + alter 'second'