What does Milling mean in metals?

Query by Neil: What does Milling imply in metals?
I am not a native english speaker but I am translating a paper in university and I have come across this sentence ” Custom milled 10mm high titanium screw-retained healing abutments”. Can a person please inform me what it indicates to mill a metal, in this case a screw?

Best answer:

Answer by Liz
When a machine carves
the metal it’s called milling.

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