American spelling: to make something black and smooth like ebony; to treat or stain wood to resemble ebony.
From ebony with the suffix -ize (American spelling of -ise), meaning 'to make' or 'to treat with.' This follows American English spelling conventions.
The existence of both 'ebonize' (American) and 'ebonise' (British) shows how the same craft technique spread across English-speaking countries with slight spelling variations reflecting regional standards.
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