Disdiapason

• (n.) An interval of two octaves, or a fifteenth; -- called also bisdiapason.
Found on http://thinkexist.com/dictionary/meaning/disdiapason/

Disdiapason

Dis·di`a·pa'son noun [ Prefix dis- (Gr. ...) + diapason .] (Anc. Mus.) An interval of two octaves, or a fifteenth; -- called also bisdiapason .
Found on http://www.encyclo.co.uk/webster/D/81
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