British and European spelling variant of hectogram, a metric unit of mass equal to one hundred grams.
Alternative spelling of hectogram used predominantly in British English and some European countries, preserving the French convention of adding 'me' to metric units.
The 'hectogramme' vs. 'hectogram' split is a fun reminder of how even modern scientific language splits along British and American lines—it's literally the same unit with a French flourish added to one spelling!
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