legendary creature

A legendary creature is a mythological or folkloric creature (often known as "fabulous creatures" in historical literature). Some creatures, such as the dragon or the griffin, have their origin in traditional mythology and have been believed to be real creatures. Others were based on real creatures, 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). The traditional unicorn may have come from garbled stories about the rhinoceros and/or narwhal. Examples of the legendary creatures can be found in medieval bestiaries.
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legendary creature
n : unverifiable but popularly accepted as possibly factual

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Noun
1. unverifiable but popularly accepted as possibly factual
(hypernym) mythical monster, mythical creature
(hyponym) abominable snowman, yeti