Subject to customs duties; having been processed through customs, or accustomed (archaic form).
Either from 'custom' (trade regulations) plus '-ed' (a past participle marker), or an archaic variant of 'accustomed.' The word is rare and appears primarily in historical commercial documents or very old texts.
Merchants in the 1600s-1800s kept records of 'customed goods'—items that had paid their customs duties and were therefore legally allowed to be sold—it's a reminder that 'customs' originally meant the officials who collected taxes, not traditions!
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