hemocytoblastosis
noun
he·mo·cy·to·blas·to·sis
variants:
or chiefly British haemocytoblastosis \ -ˌsīt-ə-ˌblas-ˈtō-səs 
\
\
plural hemocytoblastoses\ -ˌsēz
\
\
Medical Definition of hemocytoblastosis
: lymphocytomatosis of chickens