noun
: any of certain large spiral fossils from Nebraska previously reported as fossil plants or animals but now usually regarded as sediment-filled burrows of extinct rodents, possibly beavers
noun
: any of certain large spiral fossils from Nebraska previously reported as fossil plants or animals but now usually regarded as sediment-filled burrows of extinct rodents, possibly beavers
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012