Thick dark green mucoid material that is the first feces of a newborn child

WordNet Word definitions in WordNet
n. thick dark green mucoid material that is the first feces of a newborn child

Douglas Harper's Etymology Dictionary Word definitions in Douglas Harper's Etymology Dictionary
"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 ...

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Meconium \Me*co"ni*um\, n. [L., fr. Gr. ?, fr. ? poppy.] (Med.) Opium. [Obs.] The contents of the fetal intestine; hence, first excrement.

Wiktionary Word definitions in Wiktionary
n. 1 (context medicine English) A dark green mass, the contents of the fetal intestines during the later stages of mammalian gestation, that forms the first faeces of the newborn 2 (context obsolete English) opium

Wikipedia Word definitions in Wikipedia
Meconium is the earliest stool of a mammalian infant . Unlike later feces, meconium is composed of materials ingested during the time the infant spends in the uterus : intestinal epithelial cells , lanugo , mucus , amniotic fluid , bile , and water. Meconium, ...