An alternative or dialectal name for a berry, possibly a whortleberry or similar fruit; also spelled daftberry.
Of uncertain origin; possibly from 'daft' (silly, foolish) descriptively, or from a regional/dialectal plant name of unknown etymology.
Many berry names in English have murky origins—'daftberry' might describe a silly-looking berry or could be a corruption of an older plant name—it's the kind of regional dialect word that survives in old botanical texts but has mostly vanished from modern speech.
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