lym·pho·cy·to·ma \ˌ ̷ ̷ ̷ ̷ˌsīˈtōmə\noun (plurallymphocytomas \-məz\ ; orlymphocytoma·ta \-məd.ə\) Etymology: New Latin, from International Scientific Vocabulary lymphocyte + New Latin -oma 1.: a tumor in which lymphocytes are the dominant cellular elements 2.: lymphocytomatosis