Emily Dickinson Lexicon
Definition for TET-RA-DI-A-PA'SON
TET-RA-DAC'TYL-OUSTET-RA-DRACH'MA
TET-RA-DI-A-PA'SON, n. [Gr. τετρα, four, and diapason.]
Quadruple diapason or octave; a musical chord, otherwise called a quadruple eighth or twenty-ninth. Cyc.
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