1. The first feces of a newborn infant, typically dark greenish-black and composed of materials ingested in the womb.
Usage: Medical/clinical term; Plural form of meconium

Examples

• The doctor checked that the baby had passed meconiums within the first 24 hours after birth.
• Meconiums are normally sterile and contain no bacteria.
• Delayed passage of meconiums can sometimes indicate a medical concern.
• The nurse documented the color and consistency of the infant's meconiums in the medical chart.