hiidenkirnu

Noun

 * 1)  pothole, glacial pothole, giant's kettle, giant kettle pit formed in the bed of a turbulent stream

Usage notes
Of the various English terms meaning, appears to be the most common in current usage. is sometimes used to make a difference between large potholes dating back to the Ice Age and mere. was used in 1913 Webster's. Other terms include (Encyclopedia Britannica),  and. The two last ones seem to appear mostly in Scandinavian texts and may be influenced by the local language terms.