A verb meaning 'to wash off' or 'to wash one's hands of something.' Used once in Matthew 27:24 for Pilate washing his hands to declare his innocence in Jesus's condemnation.
Aponipho (G633) appears in Matthew 27:24: 'So when Pilate saw that he was gaining nothing, but rather that a riot was beginning, he took water and washed his hands (apenipsato tas cheiras) before the crowd, saying, 'I am innocent of this man's blood; see to it yourselves.'' The gesture alludes to the OT ritual of Deuteronomy 21:6-7 where elders washed hands to declare innocence in an unsolved murder. Pilate's gesture is theologically rich in irony: he performs a Jewish ritual to absolve himself of a Jewish execution, while the Jewish crowd accepts the blood-guilt he rejects. Yet his disclaimer changes nothing -- he made the decision.