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lanugo
This term is a specialized medical and biological descriptor used primarily in neonatology and embryology. It carries a neutral, clinical tone and is rarely used in casual conversation unless discussing pregnancy or newborn health.
Because it refers to a specific type of biological growth, it is treated as an uncountable mass noun. It describes the collective presence of the hair rather than individual strands, meaning it does not typically take a plural form in professional medical literature.
Meanings
Examples
The newborn was born with a light coating of lanugo on its shoulders.
Lanugo typically disappears before birth but can persist in premature infants.
Look at the fine lanugo covering the baby's back.
The presence of lanugo on an adult can be a clinical sign of severe anorexia.
The body grows lanugo to provide insulation during fetal development.
The body grows lanugo to provide insulation during fetal development.
Is this fine hair on the skin considered lanugo or vellus hair?
The fetus is covered in a layer of lanugo and vernix caseosa.
I wonder if the lanugo will shed quickly after birth.