Gui·do·ni·an
| \ gwēˈdōnēən \
Definition of Guidonian
: of or relating to the theories of medieval music theorist Guido d'Arezzo
especially
: relating to his system of solfège and theory of movable hexachords
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Merriam-Webster unabridged
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Time Traveler for Guidonian
The first known use of Guidonian was in 1721
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