my·e·lo·blast \ˈmīəlōˌblast\noun Etymology: International Scientific Vocabulary myel- + -blast 1.: hemocytoblast 2.: a cell derived from the hemocytoblast and serving as precursor for the blood granulocytes • my·e·lo·blas·tic\| ̷ ̷ ̷ ̷ ̷ ̷|blastik\adjective