IPA: //ˈʌltrəˌpjʊr//
KK: /ˈʌltrəˌpjʊr/
This word describes something that is extremely clean or free from any impurities.
The laboratory used ultrapure water for their experiments to ensure accurate results.
Ultrapure is formed from "ultra-" (meaning beyond or extreme) and "pure" (from Latin "purus", meaning clean or untainted). The word "ultrapure" describes something that is extremely clean or free from contaminants.
Think of 'beyond' ('ultra-') what is 'clean' ('pure') — that's why ultrapure means extremely clean.
No commonly confused words.