A variant or archaic spelling of 'acorn' or a small oak nut, used in some dialects.
From Old English 'acen' or 'acorn', with dialectal or regional spelling variations that persisted in specific areas and texts.
Regional spellings like 'achen' show that before standardized spelling (which only happened recently), the same word could look completely different depending on where you lived, preserving old pronunciation patterns in writing.
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