vernix caseosa
Pronunciation: VER-niks kay-see-OH-sah
A white, waxy substance covering newborns' skin at birth, providing protection in the womb.
Full Definition
Vernix caseosa is a natural biofilm composed of water, lipids, and proteins that covers the fetal skin during the third trimester of pregnancy. This protective coating prevents the skin from becoming waterlogged in amniotic fluid and has antimicrobial properties. At birth, the amount of vernix varies with gestational age - preterm infants typically have more, while post-term babies may have little or none. The substance is gradually absorbed or removed after birth, and its presence and amount are often documented in newborn assessments.
Usage
Usage note: Latin term often shortened to 'vernix' in clinical documentation. Distinguish from lanugo (fine body hair) and meconium (first stool).
In Context
- "The full-term infant was born with minimal vernix caseosa, consistent with gestational age." — Newborn examination report
- "Vernix caseosa serves as a natural moisturizer and should not be immediately washed off after delivery." — Neonatal care protocol