Bible Dictionaries
Pentachord

Webster's Dictionary

(1):

(n.) An order or system of five sounds.

(2):

(n.) An ancient instrument of music with five strings.

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