my·el·o·plax \mīˈeləˌplaks\noun (pluralmyeloplaxes \-sə̇z\ ; ormy·e·lop·la·ces \ˌmīəˈläpləˌsēz\) Etymology: New Latin, from myel- + Greek plax flat object — more at please : one of the large multinucleate cells in bone marrow : megakaryocyte, osteoclast