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Definition of Avada kedavra

Avada kedavra Definition from Arts & Humanities Dictionaries & Glossaries
The Harry Potter Glossary
Worst of the Unforgivable Curses, the killing curse. Flash of blinding green light and rushing sound. Kills without leaving a mark.
Origin:
Avada Kedavra - Aramaic for "let the thing be destroyed", it's said to be the original saying of Abra Kadabra.