Vellus hair is the short, fine, and unpigmented hair that covers most of our body. It is pronounced /ˈvɛləs hɛr/. The first syllable, "vel", rhymes with "bell" and "sell", and the second syllable, "lus", rhymes with "bus" and "plus". The "h" in "hair" is silent, and the word is spelled with a double "l" and a single "s". While vellus hair is barely visible, it serves an important function in regulating body temperature and providing sensory information.
Vellus hair, often referred to as "peach fuzz," is a term used to describe the short, thin, and soft hair that covers most parts of a person's body. It typically lacks pigmentation or appears as very light, nearly colorless strands. Vellus hair is different from terminal hair, which is thicker, longer, and usually darker, such as the hair on the scalp. This type of hair is most commonly found on areas of the body where terminal hair does not usually grow, such as the face, chest, back, and limbs.
Vellus hair serves various purposes, including providing insulation and promoting the distribution of sweat across the skin's surface. Unlike terminal hair, it does not have an outer protective layer called the cuticle, making it more delicate and prone to breakage.
Vellus hair typically develops during childhood and remains present throughout a person's life. However, under certain conditions, such as hormonal changes during puberty, vellus hair can transform into terminal hair in certain areas. This process is known as neoteny, and it contributes to the development of secondary sexual characteristics, such as facial hair growth in males.
In addition to its biological functions, vellus hair can also have social and aesthetic implications. Some people may choose to remove or diminish vellus hair for cosmetic reasons, through methods like shaving, waxing, or depilatory creams. However, it is important to note that vellus hair is a natural part of the body and generally does not pose any harm or medical concerns.
The word "vellus" comes from the Latin language. Etymologically, it can be traced back to the Latin word "velum", meaning "a thin covering" or "veil". In Latin, "vellus" specifically referred to the fleece or downy hair of sheep. Over time, the term "vellus" was adopted in English to refer to fine, soft, or downy hair present on various parts of the human body. Thus, "vellus hair" refers to the thin, short, lightly pigmented hair that covers most of our bodies.