Selenodont is a term used to describe a type of tooth structure found in some grazing herbivores, such as deer and cattle. These teeth have elongated cusps, making hard ridges running in an anterior-posterior direction ('front-to-back'). Selenodont teeth are often cheek teeth, used for grinding up tough grasses.
Some types of bilophodont molars might be mistaken for selenodonts, but they actually have multiple cusps connected by a ridge of enamel, while selenodonts have only one cusp.