Bloodthirsty Human __ Was Practised by the Aztecs
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Question is: Bloodthirsty Human __ Was Practised by the Aztecs
and the answer is: SACRIFICE
Word Meaning:
SACRIFICE — Originally, the killing (and often burning) of a human being or an animal as an offering to a deity; later, also the offering of an object to a deity.
Definitions from Wiktionary.