rancor UK /ˈɹæ̞ŋkə/US /ˈɹæ̝ŋkɚ/noun 2verb 1forms 3 noun2 •A feeling of long-lasting ire for another, sometimes to the point of hatred, over a perceived wrongdoing; bitterness.I could almost see the rancor in his eyes when he challenged me to a fight. •(rare) Rancidity, rankness. verb1 •(no longer used) To rankle or fester. formsrancored · rancoring · rancors