| megadontism | Macrodontism The state of having abnormally large teeth. Synonym: megadontism, megalodontia. (05 Mar 2000) |
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| megadosing | Medical treatment with very large doses of a nontoxic substance, usually a vitamin. (09 Oct 1997) |
| megadyne | <physics> One of the larger measures of force, amounting to one million dynes. Origin: Mega- + dyne. Source: Websters Dictionary (01 Mar 1998) |
| megaesophagus | Great enlargement of the lower portion of the oesophagus, as seen in patients with achalasia and Chagas' disease. (05 Mar 2000) |
| megafarad | <physics> One of the larger measures of electrical capacity, amounting to one million farads; a macrofarad. Origin: Mega- + farad. Source: Websters Dictionary (01 Mar 1998) |
| megagamete | The female element in anisogamy; it is the larger of the two sex cells, with more reserve material, and usually nonmotile. Synonym: megagamete. Origin: macro-+ G. Gamete, wife (05 Mar 2000) |
| megagametophyte | A plant body or cell lineage, formed by vegetative growth of the megaspore, that produces the female gametes of a heterosporous plant. (09 Oct 1997) |
| megagnathia | Enlargement or elongation of the jaw. Synonym: megagnathia. Origin: macro-+ G. Gnathos, jaw (05 Mar 2000) |
| megahertz | One million hertz. Abbreviation: MHz (05 Mar 2000) |
| megakaryoblast | The precursor of a megakaryocyte. Synonym: megacaryoblast. (05 Mar 2000) |
| megakaryocyte | <haematology> Giant polyploid cell of bone marrow that gives rise to 3-4,000 platelets. (18 Nov 1997) |
| megakaryocyte-associated tyrosine kinase | <enzyme> Genbank l18974 Registry number: EC 2.7.1.- Synonym: matk protein, csk homologous kinase, chk enzyme (26 Jun 1999) |
| megakaryocytes | Very large bone marrow cells which release mature blood platelets. (12 Dec 1998) |
| megakaryocytic leukaemia | An unusual form of myelopoietic disease that is characterised by a seemingly uncontrolled proliferation of megakaryocytes in the bone marrow, and sometimes by the presence of a considerable number of megakaryocytes in the circulating blood. When bone marrow is examined at various intervals in some instances of chronic myelocytic leukaemia, the proliferation of megakaryocytes is more prominent than that of the granulocytes; at such times, the circulating blood may contain megakaryocytes or fragments of megakaryocytic nuclei and cytoplasm, or both, amounting to as much as 5 or 6% of the total number of leukocytes. (05 Mar 2000) |
| megakaryophthisis | Degeneration of the megakaryocytes. (09 Oct 1997) |