Bullion

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Middle English: from Anglo-Norman French, in the sense ‘a mint’, variant of Old French bouillon, based on Latin bullire ‘to boil’.

wiktionary

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From Middle English bulloin, bullioun, from Anglo-Norman bullion, of obscure origin, perhaps from French bouillon, extending the sense to that of 'melting'. Middle Dutch boelioen(“base metal”) seems to have come from the unrelated French billon.

etymonline

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bullion (n.)

mid-14c., "uncoined gold or silver," from Anglo-French bullion, Old French billon "bar of precious metal," also "place where coins are made, mint," from Old French bille "stick, block of wood" (see billiards), influenced by Old French boillir "to boil," from Latin bullire "boil" (see boil (v.)), through the notion of "melting."