An alternative British spelling of decagram; a unit of mass equal to ten grams.
From Greek deca- + gramme (British spelling of gram, from Greek gramma). The British spelling preserves the French influence in metric system terminology, using -mme instead of -m.
The difference between 'decagram' and 'decagramme' shows how the same metric system has slightly different spellings in different English-speaking countries—a small reminder that even 'universal' systems have cultural variations!
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