An archaic or dialectal English term of obscure origin and meaning (historical record is unclear or extremely limited).
An extremely rare or potentially obsolete English word whose etymology is not well documented; may be a variant spelling or regional dialect term that fell out of use centuries ago.
Heypen is the kind of word that makes linguists pull their hair out—it appears in old texts just often enough to know it was a real word, but not enough to figure out what it actually meant.
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