IPA: /ˈʌltrəˌfɪltreɪt/
KK: /ˈʌltrəˌfɪltreɪt/
A liquid that has passed through a filter during a process called ultrafiltration, which removes larger particles and allows smaller ones to pass through.
The laboratory used ultrafiltrate to analyze the composition of the solution.
Ultrafiltrate → It is formed from "ultra-" (meaning beyond) and "filtrate" (from Latin "filtrare", meaning to filter). The word "ultrafiltrate" refers to a substance that has been filtered beyond the usual limits, resulting in a very fine or pure filtrate.
Think of something that has been filtered 'beyond' ('ultra-') the normal process of filtering ('filtrate') — that's what ultrafiltrate means.
No commonly confused words.