synovioma

noun
syn·​ovi·​o·​ma | \ si-ˌnō-vē-ˈō-mə How to pronounce synovioma (audio) \
plural synoviomas also synoviomata\ -​mət-​ə How to pronounce synoviomata (audio) \

Medical Definition of synovioma

: a tumor of a synovial membrane