tertian
Speech parts
1. tertian - Noun
2. tertian - Adjective
Meaning
Occurring every third day; as, a tertian fever.
A disease, especially an intermittent fever, which returns every third day, reckoning inclusively, or in which the intermission lasts one day.
A liquid measure formerly used for wine, equal to seventy imperial, or eighty-four wine, gallons, being one third of a tun.
Source: Webster's dictionarySynonyms
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a tertian tonal system
tertian fever
All triads are tertian chords (chords defined by sequences of thirds), and a major third would produce in this case a non-tertian chord.
Hippocrates described periodic fevers, labelling them tertian, quartan, subtertian and quotidian. citation The Roman Columella associated the disease with insects from swamps.
Most chords in western music are based on "tertian" harmony, or chords built with the interval of thirds.