Hamamelidaceae is not a medical term, but a taxonomic category in botany. It refers to a family of flowering plants known as the witch-hazel family. The plants in this family are characterized by their unique reproductive structures and woody stems. They include trees and shrubs that are found primarily in temperate regions of the world, particularly in East Asia and North America.

While Hamamelidaceae is not a medical term, some members of this plant family do have medicinal uses. For example, the bark of the North American witch-hazel tree (Hamamelis virginiana) contains tannins and other compounds that have astringent properties, making it useful in treating skin irritations, bruises, and minor wounds. However, direct medical definitions would typically refer to specific chemical components, pharmacological actions, or diagnostic criteria related to medical conditions or treatments, rather than taxonomic categories of plants.