1. 北极；北极地区
    The Arctic is the area of the world around the North Pole. It is extremely cold and there is very little light in winter and very little darkness in summer.

    e.g. ...winter in the Arctic.
           北极的冬天
    e.g. ...Arctic ice.
           北极地区的冰

2. 极冷的；严寒的
    If you describe a place or the weather as arctic, you are emphasizing that it is extremely cold.

    e.g. The bathroom, with its ancient facilities, is positively arctic.
           该浴室设备陈旧，肯定非常寒冷。