A unit of mass or weight for fluids, combining 'fluid' and 'gram' (though this is an extremely rare or specialized term).
Compound of 'fluid' and 'gram' (from Greek 'gramma' meaning small weight). This appears to be a very specialized or archaic technical term with minimal historical use.
This word is so obscure that it barely appears in English texts—it might have been proposed by scientists trying to create a metric system for fluid measurements, but it never caught on because the metric system already had elegant solutions.
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