>> However, a fine point about Fiona's suggested alternatives: "triad",
>> "tetrad", "pentad", etc., as well as the "-chord" constructions use
>> Greek stems, not Latin ones, so the form for seven-membered sets would
>> be "heptachord" and "heptad".
> But I like the sound of heptad, that's what I was looking for, thanks.
The commonest thing that comes in sevens in our culture is days of the
week. So just call 'em "a week of thirds", modified as necessary:
"sharp Tuesday", "minor Thursday".
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