The Collaborative International Dictionary
Osteosarcomata
Osteosarcoma \Os`te*o*sar*co"ma\, n.; pl. Osteosarcomata. [NL. See Osteo-, and sarcoma.] (Med.) A tumor having the structure of a sarcoma in which there is a deposit of bone; sarcoma connected with bone.
Wiktionary
osteosarcomata
n. (plural of osteosarcoma English)