A giant cell in the bone marrow that is the ancestor of blood platelets.
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A large cell (as much as 100 μm in diameter) with a polyploid nucleus that is usually multilobed; m.'s are normally present in bone marrow, not in the circulating blood, and give rise to blood platelets. SYN: megacaryocyte, megalokaryocyte, thromboblast. [mega- + G. karyon, nut (nucleus), + kytos, hollow vessel (cell)]

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mega·kary·o·cyte .meg-ə-'kar-ē-ō-.sīt n a large cell that has a lobulated nucleus, is found esp. in the bone marrow, and is the source of blood platelets
mega·kary·o·cyt·ic -ō-.sit-ik adj

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a cell in the bone marrow that produces platelet. It is large (35-160 µm in diameter), with an irregular multilobed nucleus, and with Romanowsky stains its abundant cytoplasm appears pale blue with fine reddish granules. See also thrombopoiesis.

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mega·karyo·cyte (meg″ə-karґe-o-sīt) [mega- + karyo- + -cyte] a giant cell 50 to 100 μm in diameter, with a greatly lobulated nucleus, found in the bone marrow; mature blood platelets are released from its cytoplasm. Called also megalokaryocyte; spelled also megacaryocyte.

Medical dictionary. 2011.

Look at other dictionaries:

  • Megakaryocyte — megakaryocytes i …   Wikipedia

  • megakaryocyte — meg a*kar y*o*cyte (m[e^]g [.a]*k[a^]r [i^]*[ o]*s[imac]t) n. (Anat.) A large bone marrow cell not usually found in the circulating blood; it is regarded as the precursors of blood platelets; it is up to 100 [mu]m in diameter, with a polyploid… …   The Collaborative International Dictionary of English

  • megakaryocyte — megakaryocyte. См. мегакариоцит. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • megakaryocyte — [meg΄ə kar′ē ə sīt΄] n. a large cell found esp. in the bone marrow, that produces blood platelets megakaryocytic [meg΄ə kar΄ē əsīt′ik] adj …   English World dictionary

  • megakaryocyte — noun Date: 1890 a large cell that has a lobulated nucleus, is found especially in the bone marrow, and is the source of blood platelets • megakaryocytic adjective …   New Collegiate Dictionary

  • megakaryocyte — Giant polyploid cell of bone marrow that gives rise to 3 4,000 platelets …   Dictionary of molecular biology

  • megakaryocyte — megakaryocytic /meg euh kar ee euh sit ik/, adj. /meg euh kar ee euh suyt /, n. Cell Biol. a large bone marrow cell having a lobulate nucleus, regarded as the source of blood platelets. [1885 90; MEGA + KARYO + CYTE] * * * …   Universalium

  • megakaryocyte — noun A large cell, found in bone marrow, responsible for the production of platelets. See Also: promegakaryocyte, megakaryoblast, megakaryocytic, amegakaryocytic, megakaryocytopoiesis …   Wiktionary

  • megakaryocyte — n. large cell with a nucleus in the bone marrow (Biology) …   English contemporary dictionary

  • megakaryocyte — mega·karyocyte …   English syllables

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