hadronPronunciation: /ˈhadrɒn/Definition of hadron noun Physics a subatomic particle of a type including the baryons and mesons, which can take part in the strong interaction. Derivatives hadronicPronunciation: /-ˈdrɒnɪk/ adjective Origin: 1960s: from Greek hadros 'bulky' + -onhadron in other Oxford dictionaries Definition of hadron in the US English dictionary