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

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n. A bonelike substance covering the root of a tooth.

n. A bony substance that covers the root of a tooth; cement.

n. In anatomy, same as cement, 4.

n. a specialized bony substance covering the root of a tooth

"Lieberman looked at the growth patterns of a bonelike tissue called cementum, which is continuously deposited around the roots of mammalian teeth."

solid body substance