D defs.my
Entry 2 senses Webster, 1913

Diesis

· Di·e·sis · IPA /ˈdaɪ.ə.sɪs/
01 n. A small interval, less than any in actual practice, but used in the mathematical calculation of intervals.
pl. Dieses ((#))
  1. 1.
    A small interval, less than any in actual practice, but used in the mathematical calculation of intervals.(Mus.)
  2. 2.
    The mark ‡; -- called also double dagger. It is used in printing to indicate a cross reference or footnote(Print.) Also: double dagger
Syn. double obelisk.