(Zool.) Any rodent of the genus Marmota (formerly Arctomys) of the subfamily Sciurinae. The common European marmot (Marmota marmotta) is about the size of a rabbit, and inhabits the higher regions of the Alps and Pyrenees. The bobac is another European species. The common American species (Marmota monax) is the woodchuck (also called groundhog), but the name marmot is usually used only for the western variety.