Diesis
Pronunciation : Di"e*sis
Part of Speech : n.;
Etymology : [NL., fr. Gr.
Definition : 1. (Mus.)
Defn: A small interval, less than any in actual practice, but used in the mathematical calculation of intervals.
2. (Print.)
Defn: The mark ||; -- called also double dagger.
pl. Dieses.
Source : Webster's Unabridged Dictionary, 1913