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1.
To murder the gods.
"Titanomachy raged across Thessaly, and all the horrors of Theocide were unleashed upon Titan and Olympian alike.
by Titanomachy August 05, 2010
 
2.
The systematic eradication of a certain religion.
During World War II, Germany has committed Theocide against the Jews.
by dood_dle August 13, 2005