Definition of osteoclastoma in US English:

osteoclastoma

noun

  • An osteolytic tumour of bone, usually benign, composed of giant cells of osteoclastic type and stromal cells; also called giant cell tumour of bone. Also: a localized area of increased osteoclastic activity, seen in certain disorders or tumours of bone (now rare).

Origin

1920s; earliest use found in Journal of Pathology and Bacteriology. From osteoclast + -oma.