Dī'e-sĭs, n.

Dī'e-sĭs, n. [Gr. δίεσις, from διιέναι, to let go through, to dissolve, from δί, for δία, through, and ἱέναι, to let go, to send; Fr. dièse.]

1. (Mus.) A small interval, less than any in actual practice, but used in the mathematical calculation of intervals.
2. (Print.) The mark ‡; — called also double dagger. Eng. Cyc.