Breadcrumb Home > Dictionary > Index O osteosarcoma: Meaning and Definition of Find definitions for: os•te•o•sar•co•ma Pronunciation: (os"tē-ō-sär-kō'mu), [key] — pl. -mas, -ma•ta a malignant tumor of the bone. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: osteosarcoma (Thesaurus) osteoradionecrosis osteosclerosis TrendingHere are the facts and trivia that people are buzzing about. Biographies: Notable Jewish Religious Leaders Current Events This Week: September 2023 Hispanic Population and the 2010 U.S. Census 50 Spookiest Halloween Quotes Preamble of the United Nations Charter The Jewish Calendar ✖ Related Content Daily Word Quiz: quincunx Analogy of the Day: Today’s Analogy Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language