osteoma

n. tumor of bone tissue; tumor of bone cells

An osteoma (plural: "osteomata") is a new piece of bone usually growing on another piece of bone, typically the skull. It is a benign tumor.When the bone tumor grows on other bone it is known as "homoplastic osteoma"; when it grows on other tissue it is called "heteroplastic osteoma".
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Osteoma /os·te·o·ma/ a benign, slow-growing tumor composed of well-differentiated, densely sclerotic, compact bone, occurring particularly in the [more]Osteoma - Community and Resources

Noun
1. a slow growing benign tumor of consisting of bone tissue; usually on the skull or mandible
(hypernym) benign tumor, benign tumour, nonmalignant tumor, nonmalignant tumour, nonmalignant neoplasm

n. osteoma, tumor of bone tissue; tumor of bone cells