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[mi-koh-nee-uh m] /mɪˈkoʊ ni əm/

the first fecal excretion of a newborn child, composed chiefly of bile, mucus, and epithelial cells.
fecal mass released at pupation by the larvae of some insects.
the milky sap of the unripe seed pods of the opium poppy; crude opium.
the dark green mucoid material that forms the first faeces of a newborn infant
opium or the juice from the opium poppy

“fecal discharge from a newborn infant,” 1706, from Latin meconium “excrement of a newborn child,” literally “poppy juice,” from Greek mekonion “poppy-juice, opium,” diminutive of mekon “poppy” (perhaps cognate with Old Church Slavonic maku, German Mohn “poppy”). So called by classical physicians for its resemblance. Related: Meconial.

meconium me·co·ni·um (mĭ-kō’nē-əm)


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  • Meconium aspiration

    meconium aspiration n. Aspiration of amniotic fluid contaminated with meconium by a fetus in hypoxic distress.

  • Meconium ileus

    meconium ileus n. Intestinal obstruction in a newborn child following the thickening of meconium resulting from a lack of trypsin and associated with cystic fibrosis of the pancreas.

  • Meconium peritonitis

    meconium peritonitis n. Peritonitis caused by intestinal perforation in the fetus or newborn, and associated with congenital obstruction or fibrocystic disease of the pancreas.

  • Meconopsis

    /ˌmɛkəˈnɒpsɪs/ noun 1. any plant of the mostly Asiatic papaveraceous genus Meconopsis, esp M. betonicifolia (the Tibetan or blue poppy), grown for its showy sky-blue flowers. M. cambrica is the Welsh poppy

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