Simple past tense and past participle of inter.(verb)
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Use "interred" in a sentence
"Achmatova and Zamjatin - interred alive throughout their lives - are condemned to create in silence until they die, never hearing the echo of their written words, then that is not only their personal tragedy, but a sorrow to the whole nation, a danger to the whole nation."
"Just before this we had by the roadside a common looking Arab burial-place, named _Shaikh Sad_; probably from some Mohammedan devotee of that name interred there; and among the stones about the graves is a fragment of an ancient cornice, deeply sculptured in the pattern here shown."
"The word "interred" is used a couple of times when I suspect that "interned" is actually meant."