har·​mo·​nist | \ˈhär-mə-nist \
plural -s

Definition of harmonist 

1a : a member of a school of theorists in ancient Greece who intensively investigated the mathematical basis for musical pitch relations

b archaic : a person who composes or performs music

c : a composer who emphasizes harmony above other musical elements

d : a musician skilled in performing or improvising harmony

e : a collection of songs or hymns a religious songbook titled The Devotional Harmonist

2 : one who shows the agreement or harmony of corresponding passages of different literary works (as the Gospels) editorial harmonists of the PentateuchInterpreter's Bible

4 usually capitalized [ Harmony, community in Pennsylvania + English -ist ] : harmonite

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History and Etymology for harmonist

harmony + -ist

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