Caliber comes from the old French calibre (14c.), from the Arabic qalib “a mold, last”, which derives from the Greek calapous [Gr: καλάπους] “a shoemaker’s last” lit. “little wooden foot,” from calon “wood” + pous “foot”.*
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From the same root: calibrate, calibration.
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In modern Greek:
a) calapodi: a shoemaker’s last, a little wooden foot [Gr: καλαπόδι]
b) calibraro: calibrate [Gr:καλιμπράρω], loanword
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* Babiniotis G.: Etymological Lexicon of Modern Greek Language p614 and p615
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