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Sesquialter
Sesquialter Ses`qui*al"ter, a.
Sesquialteral.
Sesquialter
Sesquialter Ses`qui*al"ter, Sesquialtera Ses`qui*al"ter*a,
n. [NL. sesquialtera.] (Mus.)
A stop on the organ, containing several ranks of pipes which
re["e]nforce some of the high harmonics of the ground tone,
and make the sound more brilliant.
Meaning of Sesquialter from wikipedia