Bible Dictionaries
Diesis

Webster's Dictionary

(1):

(n.) The mark /; - called also double dagger.

(2):

(n.) A small interval, less than any in actual practice, but used in the mathematical calculation of intervals.

Bibliography Information
Webster, Noah. Entry for 'Diesis'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​d/diesis.html. 1828.