IPA: /ˈpjʊərər/
KK: /pjʊrər/
Having a higher level of cleanliness or quality, often used to describe something that is free from impurities or contaminants.
The water from the mountain spring is purer than the water from the city.
Purer → It is formed from "pure" (from Old French *pur*, meaning clean or untainted) and "-er" (meaning more). The word "purer" means more clean or untainted than something else.
Think of something that is 'more clean' or 'more untainted' — 'pure' describes cleanliness, and '-er' indicates a comparison.