n, pl  -mas  or  -ma*ta   :  a tumor derived from more than one embryonic layer and made up of a heterogeneous mixture of tissues (as epithelium, bone, cartilage, or muscle) ter*a*to*ma*tous adj 
 
 
 
Similar sounding terms:  tri·at·o·ma  tri·ti·um 
 
Published under license with Merriam-Webster, Incorporated.  © 1997-2024.