D / dĭĕsis
noun greek

dĭĕsis

gen. dĭĕsis · gender feminine · decl. 3rd
= δίεσις. In ancient music
A quarter-tone
A quarter-tone, Vitr. 5, 4; Macr. Somn. Scip. 2, 1 fin.
The first audible tone of an instrument
The first audible tone of an instrument, Vitr. 5, 3.