groundhog UK /ˈɡɹaʊndhɒɡ/US /ˈɡɹaʊn(d)ˌ(h)ɔɡ/ noun3 •A red-brown marmot, Marmota monax, native to North America.In 1909, local newspapers reported that the governor of Pennsylvania attended the group’s annual feast and 400 groundhogs were served to 400 guests. — 2016 •(rare) The aardvark. •Synonym of groundlubber formsgroundhogs