AdullamitePronunciation: /əˈdʌləmʌɪt/Definition of Adullamite noun a member of a dissident political group (originally applied to a group of British MPs who seceded from the Liberal party in 1866). Origin:adopted in allusion to the cave of Adullam, where those discontented with the rule of Saul came to join David (1 Sam. 22:1-2)