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metamerism

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(mĕ-tăm′ĕr-ĭzm) 1. Isomerism. 2. Isomerism consisting of segments or metameres. metameric (mĕt-ă-mĕr′ĭk), adj.

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metamorphopsia

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(mĕt″ă-mor-fŏp′sē-ă) [Gr. meta, after, beyond, over, + morphe, form, + opsis, vision] Distortion of vision, esp. of the central visual field.

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metamyelocyte

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(mĕt″ă-mī-ĕl ō-sīt) A transitional cell intermediate in development between a myelocyte and a mature granular leukocyte. SYN: juvenile cell.

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metanephrine

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(mĕt″ă-nĕf′rĭn) An inactive metabolite of epinephrine.

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metanephroi

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(met″ă-nef′roy″) Plural of metanephros.

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metanephros

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(met″ă-nef′rŏs, met″ă-nef′ros″, met″ă-nef′roy″) pl. metanephroi [meta- + nephros] The permanent kidney of amniotes (reptiles, birds, and mammals). Part of the metanephros develops from the caudal portion of the intermediate cell mass or nephrotome; the remaining portion is derived from a bud of the mesonephric duct. SEE: mesonephros; pronephros.

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metaparadigm

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(mĕt-ă-păr-ă-dīm′) The concepts that identify the phenomena of central interest to a discipline; the propositions that describe those concepts and their relationships to each other.

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metaphase

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(mĕt′ă-fāz) [″ + phasis, an appearance] The second stage of mitosis in which the pairs of chromatids line up on the equator of the cell. Each pair is connected at the centromere, which is attached to a spindle fiber. Metaphase follows prophase and precedes anaphase, in which the chromatids become chromosomes and are pulled to opposite poles of the cell. SEE: cell division for illus; mitosis.

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metaphysis

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(mĕ-taf′ĭ-sĭs, mĕ-taf′ĭ-sēz″) pl. metaphyses [meta- + Gr. physis, growth, nature] The portion of a developing long bone between the diaphysis, or shaft, and the epiphysis; the growing portion of a bone. metaphyseal, metaphysial (mĕ-taf″ĭ-sē′ăl), adj.

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metaplasia

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(met″ă-plā′zh(ē-)ă) [meta- + -plasia] Conversion of one kind of tissue into a form that is not normal for that tissue. metaplastic (-plas′tik), adj.

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myeloid m. Extramedullary hematopoiesis.

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metarteriole

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(met″ar″tēr′ē-ōl″) A small vessel connecting an arteriole to a venule from which true capillaries are given off. SYN: precapillary.

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metastasectomy

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(mĕ-tăs″tă-sĕk′tă-mē) [″ + ″] Surgical removal of cancerous growths that have spread from the original tumor to other locations around the body.

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metastasis

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(mĕ-tas′tă-sĭs, mĕ-tas′tă-sēz″) pl. metastases [meta- + stasis] 1. Movement of bacteria or body cells (esp. cancer cells) from one part of the body to another. 2. A change in the location of a disease from one part of the body to another. Diseases (such as cancer) may spread by direct invasion or through body fluids, e.g., the bloodstream, lymphatics, cerebrospinal fluid, or urine. SEE: illus.

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