fungicidePronunciation: /ˈfʌn(d)ʒɪsʌɪd, ˈfʌŋgɪ-/Definition of fungicide noun a chemical that destroys fungus: many orchards no longer use fungicides [mass noun]:cut away any rotten parts before dusting with fungicideDerivatives fungicidalPronunciation: /-ˈsʌɪd(ə)l/ adjective fungicide in other Oxford dictionaries Definition of fungicide in the US English dictionary