More clean; having a greater degree of cleanliness compared to something else.
From 'clean' + comparative suffix '-er,' or from 'cleanly' (the adverb/adjective) + comparative '-er.' The comparative form allows ranking objects by their cleanliness.
Victorians became obsessed with comparative cleanliness—doctors would rank neighborhoods as cleanlier or dirtier, using it to justify social hierarchies, though it actually revealed more about access to water and sewage!
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