lym·pho·blast \ˈlim(p)fəˌblast\noun Etymology: International Scientific Vocabulary lymph- + -blast 1.: a cell giving rise to lymphocytes 2.: a primitive undifferentiated hemocyte — used only by those who consider that all blood cells have a common origin; compare myeloblast • lym·pho·blas·tic\| ̷ ̷ ̷ ̷|blastik\adjective