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Pyramidon, pi-ram′i-don, n. in organ-building a stop having wooden pipes in the form of an inverted pyramid, giving very deep notes somewhat like those of a stopped diapason.

But she pulled out every stop of the feminine organ, the clarion, the stopped diapason, flute, bird-stop, vox humana, and, lastly, the tremolo stop.

They are of several kinds, as open diapason, stopped diapason, double diapason.

In teaching new music, and, generally speaking, in accompanying the boys, play the note they are singing and its octave above—on the stopped diapason and flute if an organ, or the corresponding stops on a harmonium.

The stops in the great organ are, the stopped diapason, two open diapasons, flute, and principal, trumpet and baffoon, all entire, the 12th, 15th, sesqui-altera, cornet and clarion.