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Italian word macellaio comes from Italian macello, Italian -aio
macello (Italian)
(figuratively) mess. Slaughter, massacre. Slaughterhouse, abattoir.
-aio (Italian)
A suffix used to form agent nouns.. Used to form words, derived from nouns, meaning a place or (more rarely) an animal associated with the specified object.
macellaio (Italian)
Butcher.