A tumor of bone tissue

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Osteoma \Os`te*o"ma\, n.; pl. Osteomata . [NL. See Osteo- , and -oma .] (Med.) A tumor composed mainly of bone; a tumor of a bone.

Wikipedia Word definitions in Wikipedia
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 ...

Wiktionary Word definitions in Wiktionary
n. (context medicine English) A benign bony tumour that typically grows on the skull

WordNet Word definitions in WordNet
n. a slow growing benign tumor of consisting of bone tissue; usually on the skull or mandible [also: osteomata (pl)]