An archaic or poetic past participle of admix; mixed or blended together, especially used in older literature.
From admix (Latin admiscere) with -t, an archaic past participle ending. In Middle and Early Modern English, many verbs used -t instead of or alongside -ed (like 'burnt' versus 'burned').
Admixt is delightfully archaic—you might find it in Shakespeare or 17th-century poetry as 'With humours admixt from ages past.' The -t ending is a fossil from when English had more verb endings, now mostly replaced by -ed.
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