This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Simple past tense and past participle of intomb.

"Guiscardo, wherefore beholding the seruaunt, she saide vnto him: “Truly it behoueth that such a hart as this is, shoulde be intombed in no worse graue then in golde, which my father hath most wisely done.”"

entombed    intoned