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countable and uncountable, plural meconiums
(medicine) A dark green mass, the contents of the fetal intestines during the later stages of mammalian gestation, that forms the first feces of the newborn. quotations examples
The meconium is dark brownish-green in color. The first meconium passed is semi-solid, having been partially dried out in the large intestine.
1915, John Lovett Morse, Fritz Bradley Talbot, Diseases of Nutrition and Infant Feeding, New York: MacMillan, page 78
(obsolete) Opium.