\Di`a*tes"sa*ron\, n. [L., fr. Gr. ? (sc. ?); dia`
through + ?, gen. of ? four (sc. ?.).]
1. (Anc. Mus.) The interval of a fourth.

2. (Theol.) A continuous narrative arranged from the first
   four books of the New Testament.

3. An electuary compounded of four medicines.