Hairsplitting a. : Making excessively nice or trivial distinctions in reasoning; subtle.

Hairsplitting n. : The act or practice of making trivial distinctions.

Example:
Has the debate officially ended on which element is the densest? Osmium or iridium?

Taxonomy
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Defination from the web:
hairsplitting in the Online Dictionary. Meaning of hairsplitting. Pronunciation of hairsplitting. Translations of hairsplitting. ... `There is some hairsplitting and nit-picking, but for the most part, the city and the department has stood tough and said there can't be ...