Cosmetic definition: external applications characterized by beautifying, cleansing, or altering appearance for product classification and regulation. Cosmetic is an external preparation applied to the human body or parts thereof for beautifying, cleansing, preserving, promoting attractiveness, or altering appearance; examples include face powder, lipstick, skin creams, hair dressings, deodorants, shampoos, nail polish, perfume and certain dentifrices. The classification of a product as a cosmetic is determined by its mode of external application and its intended aesthetic or cleansing function, distinguishing it from medicinals and soaps.