A share or portion of density; a hypothetical or technical term for a proportional unit of density.
From dense + share. This appears to be either a very technical neologism, a specialized term in a particular field, or possibly a non-standard/rare term. The combination of dense + share suggests something related to proportional density measurement.
This is a fascinating oddity—if it's a real technical term, it would represent the kind of specialized vocabulary that different fields create for precise measurement, but it's quite rare and may be more theoretical than practical.
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