arctic(noun, adjective) adjective1. of or relating to the Arctic- the Arctic summerSimilar word(s): polar2. extremely cold- an arctic climateSimilar word(s): cold, frigid, gelid, glacial, icy, polar noun1. the regions to the north of the Arctic Circle centered on the North PoleDefinition categories: location2. a waterproof overshoe that protects shoes from water or snowSimilar word(s): galosh, golosh, gumshoe, rubberDefinition categories: man–made, overshoe