One of the mysteries of the English language finally explained.
A document or estreat giving notice of a fine, amercement, etc., delivered by the Exchequer and bearing a green wax seal; such documents regarded collectively; (in extended use) the office issuing them. Also in "process (also amerciament, issue) of green wax". Compare "green cloth". Now historical.
Middle English. From green + wax.
green wax/ˈɡriːn ˌwaks/
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