Guido d'Arezzo (also called Fra Guittone) †about 1050 Benedictine monk and musical reformer + English -ian
1721, in the meaning defined above
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“Guidonian.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Guidonian. Accessed 28 Sep. 2023.
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