- More formally known as vernix caseosa, the vernix is a white cheesy substance that covers and protects the skin of the fetus and is still all over the skin of a baby at birth. Vernix is composed of sebum (the oil of the skin) and cells that have sloughed off the fetus' skin. "Vernix" is the Latin word for "varnish." The vernix varnishes the baby. ("Caseosa" is "cheese" in Latin.)
* * *- v. caseosa the fatty substance, consisting of desquamated epithelial cells, lanugo hairs, and sebaceous matter, which covers the skin of the fetus.
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* * *ver·nix (vurґniks) [L. â€œsandaracâ€ (resin), from Gr. Berenikē (now Benghazi) where first made] varnish.
Medical dictionary. 2011.