1) The thick green-to-black mucilaginous material found in the intestines of a full-term fetus. It consists of secretions of the intestinal glands, bile pigments, fatty acids, amniotic fluid, and intrauterine debris. It constitutes the first stools passed by a newborn.

2) A dark greenish mass of desquamated cells, mucus, and bile that accumulates in the bowel of a fetus and is typically discharged shortly after birth.