More dense; the comparative form indicating greater thickness or closer packing than something else.
From dense + -er (comparative suffix). When comparing two things, English adds -er to short adjectives; 'densher' follows this productive pattern, though it's somewhat rare in modern usage.
While 'denser' is the standard spelling and 'densher' is dialectal or archaic, both are grammatically valid—English has always had variation in how people pronounce and spell these comparatives, and regional dialects maintained different forms.
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