An archaic or dialectal name for hawthorn or similar thorny plants that grow in hedgerows and hay fields.
From 'hay' + 'thorn' (from Old English 'þorn'). This regional variant reflects how the same plants received different names based on their location or association with hay fields.
Haythorn shows how English rural vocabulary was incredibly granular—the same hawthorn might be named based on where it grew (hay-field thorn) or what it looked like, creating a linguistic diversity that modern standardized English has mostly erased.
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