Thremmatology is the study of hair, including its growth, structure, and functions. Some synonyms for thremmatology include trichology, study of hair, pilology, and capillology. Trichology is the most commonly used term for the study of hair, and it also encompasses the study of scalp and hair conditions, such as hair loss, dandruff, and scalp inflammation. Pilology is a less commonly used term for the study of hair, but it is often used in the context of evolutionary biology to study the development of hair in animals. Capillology is a term that specifically focuses on the study of hair structure and function.