dĭĕsis, is, f., = δίεσις. In ancient music,
I A quarter-tone , Vitr. 5, 4; Macr. Somn. Scip. 2, 1 fin. —
II The first audible tone of an instrument , Vitr. 5, 3.
·noun The mark /; — called also double dagger. II. Diesis ·noun A small interval, less than any in...
Webster's Dictionary of the English Language