\Ses`qui*al"ter\, a.
Sesquialteral.

\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.