meconium

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A dark green fecal material that accumulates in the fetal intestines and is discharged at or near the time of birth.

[Latin mēcōnium, poppy juice, from Greek mēkōnion, from mēkōn, poppy.]

1. A dark green fecal material that accumulates in the fetal intestines and is discharged at or near the time of birth.
2. See opium.

Yellow-orange mucilaginous material in the intestine of the full-term fetus; it constitutes the first stools passed by the newborn.

• m. aspiration — aspiration of fragments of meconium into the pulmonary airways occurs in the fetus in the terminal stages of many infections.
• m. ileus — intestinal obstruction in the newborn due to the blocking of the bowels with thick meconium. This is an important disease of newborn colt foals. The syndrome is usually one of subacute abdominal pain, restlessness and straining, and a positive finding on rectal examination. Occasional cases show severe pain and tympany of the large intestine. Called also meconium retention.
• m. retention — see meconium ileus (above). See also impaction colic.

The noun has one meaning:

Meaning #1: thick dark green mucoid material that is the first feces of a newborn child