Lanugos

Part of speech: noun

Definitions

1. A fine, soft down or hair found covering the body of a fetus
2. The light, fluffy hair typically present on the skin of newborns that may shed shortly after birth
3. A term used to describe the soft, often downy type of hair that serves as insulation in utero

Etymology: The term in question is the plural form of "lanugo," a word that entered English usage around the late 17th century. It originally referred to the fine, soft hair that covers the body of a fetus or newborn, a feature that is typically shed before or shortly after birth. This delicate fuzz provided the basis for the word’s meaning and its distinctive, almost poetic quality. Its roots trace back to Latin, where "lanugo" meant "wool" or "down," derived from "lana," meaning "wool." This connection to wool is fitting, as the hair in question closely resembles the fine fleece of sheep—soft, thin, and almost imperceptible. The transition from a general term for wool to the specific biological hair covering an infant’s body reflects a common linguistic narrowing of meaning from a broad material category to a precise natural phenomenon. The plural form "lanugos" is less commonly encountered but follows a typical pattern in English where Latin-derived nouns adopt an English-style plural ending "-s" instead of the classical Latin plural "-ina." This anglicized pluralization reflects the word’s integration into English medical and biological terminology, where clarity and ease of use tend to override strict adherence to Latin grammar. Overall, the history of this term reveals a straightforward but vivid lineage—from the tangible wool of livestock to the ephemeral hair of the human body, capturing a delicate stage of early human development with a word that softly echoes the texture it describes.

Synonyms: fine hairs, baby hairs, soft hairs, down hairs, vellus hairs