osteoma

noun, plural os·te·o·mas, os·te·o·ma·ta [os-tee-oh-muh-tuh] /ˌɒs tiˈoʊ mə tə/. Pathology.

1. a benign tumor composed of osseous tissue.

noun plural -mata (-mətə) or -mas

1. a benign tumour composed of bone or bonelike tissue

n. pl. os•te•o•mas

1. A benign tumor composed of bony tissue, often developing on the skull.