Alternative or variant form of 'billetty', meaning covered with or adorned with small rectangular patterns or billettes.
Variant spelling of 'billetty', following inconsistent historical spelling conventions in heraldic terminology. Both forms appear in medieval heraldic texts with the same meaning.
Medieval heralds weren't great about standardizing spelling—you'll find the same heraldic pattern described as 'billety' or 'billetty' in different documents, showing how fluid technical terminology was before modern standardization.
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