Author: Glossary
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Megaton
The equivalent to a million tons. Often used to describe the explosive power of an atomic bomb, e.g., a 1 megaton bomb has the explosive power of one million tons of TNT.
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Megaspore-mother-cell
Megasporocyte.
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Megasporogenesis
The process of production of megaspores.
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Megablast
A large, nucleated embryonic type of cell. A is found in the blood in cases of pernicious anemia, vitamin B12 deficiency, and folacin deficiency.
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Medullary sheath
The layer surrounding a medullated nerve fiber.
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Medullary plate (groove and tube)
The three successive shapes in the embryonic development of the central nervous system of vertebrates. The central portion of the ectoderm in the embryo developing into the neural canal.
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Medulla
The deep, inner substance or tissue of an organ or part, as of the kidney or of a hair. The soft inner part of an organ, as opposed to the outer cortex. Any structure similar to bone marrow. Medullae, innermost part of an organ or structure, as in the adrenal medulla. Innermost area of an…
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Medigap insurance
Supplementary health insurance.
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Medieval period
The period in Europe from A.D. 476 to 1300.
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Medical waste tracking act of 1988 (MWTA)
Legislation passed by the U.S. Congress to assist in developing a national policy on the management of medical waste.