n, pl  -mas  also  -ma*ta   :  a malignant neoplasm arising in tissue of mesodermal origin (as connective tissue, bone, cartilage, or striated muscle) that spreads by extension into neighboring tissue or by way of the bloodstream - compare CANCER1 CARCINOMA TUMOR  .
 
 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2004.