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endocannibalism

n. A form of cannibalism, the eating of dead members of one's own social group, often associated with spiritual beliefs.

Wikipedia
Endocannibalism

Endocannibalism is a practice of eating the flesh of a human being from the same community ( tribe, social group or society), usually after they have died. Endocannibalism has also been used to describe the consumption of relics in a mortuary context.