† trisdiaˈpason Mus. Obs.
[f. tris- + diapason, after disdiapason.]
An interval of three octaves, a twenty-second; a note three octaves above or below a given note. (Cf. tridiapason, tri- 4 a.)
| 1677 Plot Oxfordsh. 293 And so will strike an under trisdiapason, or a 22{supd}. 1706 Phillips (ed. Kersey), Tris-Diapason, or Triple-Diapason..a Chord, otherwise call'd a Triple Eighth. |