IPA: /ˈæsɪdɪfaɪər/
KK: /ˈæsɪdɪfaɪər/
A substance that makes something more acidic or increases acidity, often used in agriculture to improve soil quality.
The farmer added an acidifier to the soil to enhance crop yield.
Acidifier is formed from "acid" (from Latin "acidus", meaning sour) and "-ifier" (from Latin "-ificare", meaning to make or to cause). The word refers to something that makes or causes something to become sour or acidic.
Think of 'acid' meaning sour, and '-ifier' meaning to make. So, an acidifier is something that makes something else sour.