acidifyPronunciation: /əˈsɪdɪfʌɪ/Definition of acidify verb (acidifies, acidifying, acidified) make or become acid: [with object]:pollutants can acidify surface waterDerivatives acidificationPronunciation: /-fɪˈkeɪʃ(ə)n/ noun acidify in other Oxford dictionaries Definition of acidify in the US English dictionary