Sesqui-altera
A mixture-stop in the organ.
In ancient musical nomenclature the following compounds with Sesqui were used :- Sesqui-nona, i. e., the ratio of 9 to 10; minor whole tone.
Sesqui-octava, 8 to 9; major whole tone.
Sesqui-quinta, 5 to 6; minor third.