Lyonnesse
noun
Ly·on·nesse
ˌlī-ə-ˈnes 
: a country that according to Arthurian legend was contiguous to Cornwall before sinking beneath the sea
Word History
First Known Use
15th century, in the meaning defined above
Time Traveler
The first known use of Lyonnesse was
in the 15th century
Dictionary Entries Near Lyonnesse
Cite this Entry
“Lyonnesse.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/Lyonnesse. Accessed 30 Sep. 2023.
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More from Merriam-Webster on Lyonnesse
Britannica.com: Encyclopedia article about Lyonnesse
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