hairier

Hairier is the comparative form of the adjective hairy. It is used to describe something that has more hair or a greater degree of hairiness than another thing. For example, a wolf may be hairier than a domestic dog, and a woolly mammal is typically hairier than one with a short coat. The word is formed by taking the noun hair and adding the comparative suffix -ier, a common English pattern for degrees of a property.

In biology, hairiness varies widely across species and individuals. Genetic factors largely determine hair density and length, while hormones such as androgens influence hair growth in many mammals, including humans. Seasonal changes, age, and environmental conditions can alter perceived hairiness. Some breeds naturally have thicker coats, while others have sparse hair.

Medical and cultural notes: In humans, unusual hairiness in typical female patterns can be described as hirsutism, often related to hormonal imbalances. Conversely, very low hair density is called alopecia. In animal care and breeding, coat condition and length are frequently described in terms of hairiness or fullness, affecting insulation and appearance.

Usage and perception: Hairier is widely understood but can be used humorously or informally. It appears in everyday comparisons and descriptive writing but is less common in formal scientific writing, where more precise descriptors of hair density, length, or coat type are preferred.