British and French spelling variant of centigram; a unit of mass equal to one hundredth of a gram.
From the same roots as centigram ('centi-' + 'gramme'), but using the French spelling with '-mme' instead of '-m.' Both spellings were official in different countries.
The '-mme' spelling shows how British English kept French spelling conventions longer than American English—modern British style guides often accept both 'gram' and 'gramme,' unlike American English which standardized on 'gram'!
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