chlo·ro·ma \kləˈrōmə\noun (pluralchloromas \-məz\ ; orchloro·ma·ta \-məd.ə\) Etymology: New Latin, from chlor- + -oma : leukemia originating in the bone marrow and marked by the formation of tumorlike growths of myeloid tissue beneath the periosteum of flat bones (as the skull, ribs, or pelvis) • chlo·rom·a·tous\-ˈräməd.əs, -ōm-\adjective