Edentulous comes to English directly from the Latin word edentulus, which in turn comes from the Latin prefix e-, meaning "missing" or "absent," and the Latin root dent-, meaning "tooth." This root is at work in many familiar English words that relate to teeth, including "dental," "dentist," and "denture." It is also found in "edentate," a less common word that functions as a noun referring to an order of mammals with few or no teeth (e.g. sloths and armadillos), and as an adjective describing such mammals. "Edentate" is also sometimes used as a synonym of "edentulous."