giant cell tumor of bone

n.
  1. A sometimes malignant osteolytic tumor composed of multinucleated giant cells and ovoid or spindle-shaped cells. It occurs most frequently in an end of a long tubular bone.giant cell myeloma osteoclastoma
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.