Why is "dieing" (To cut, form, or stamp with or as if with a die.) not listed in the Webster dictionary?

I can only find this definition on dictionary.com , but I can't find it on other sites or hand-held dictionaries. Can anyone explain as to why this is?Why is "dieing" (To cut, form, or stamp with or as if with a die.) not listed in the Webster dictionary?
You would have to ask the publishers of those dictionaries.

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