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Stage 1 of 3
qalib
Arabic · medieval
"a mold, a form"
a mold used for casting metal, especially for shaping bullets
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Stage 2 of 3
calibre
French · 1500s
"the internal diameter of a tube or barrel"
adopted into French for the internal diameter of a gun barrel
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Stage 3 of 3
caliber
English · 1500s
"the diameter of a gun's bore, or a measure of quality"
settled as the word for a firearm's bore diameter, later a measure of quality
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