WordNet
n. unverifiable but popularly accepted as possibly factual
Wikipedia
A legendary creature is an animal described in non-historical stories that sometimes involve the supernatural. Other legendary animals, such as the unicorn, were claimed in accounts of natural history by various scholars of antiquity.
The definitions of legendary and mythological have been debated with no widely agreed upon application. Some legendary creatures have their origin in traditional mythology and were believed to be real creatures, for example dragons, griffins, and unicorns. Others were based on real encounters, originating in garbled accounts of travelers' tales, such as the Vegetable Lamb of Tartary, which supposedly grew tethered to the earth (and was actually a type of fern).
Usage examples of "legendary creature".
For a legendary creature, the methods of its destruction seemed to be taken very seriously indeed.
The horse again would be a quite legendary creature to our Cretan, a sort of super-ass which lived in the bleak northern lands far away beyond the Black Sea.
I knew that the story of my nights on the hill and my habit of sleeping on the coldest part of the floor were known to everyone, and while they called me Lake-drinker to my face, I overheard references to Man-of-the-Wind, a legendary creature who comes either to kill or cure, brought by the cold wind and taken, eventually, by the sea.
And for myself, I claim the legendary creature that rises from its own ashes—.
Eager watch was kept for the first appearance of the legendary creature in the village, and it may be said that as far as appearances went Basil Blake was all that could be asked for.
Through a combination of circumstances no more remarkable than those producing a royal flush in stud poker, Abnego's physique, psyche, and other miscellaneous attributes had resulted in that legendary creature—.