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From The Collaborative International Dictionary of English v.0.48:
Myeloplax \My*el"o*plax\, n.; pl. E. Myeloplaxes, L. Myeloplaces. [NL., fr. Gr. myelo`s marrow + ? anything flat and broad.] (Anat.) One of the huge multinucleated cells found in the marrow of bone and occasionally in other parts; a giant cell. See Osteoclast. [1913 Webster]