Prose
The word "prose" first appears in English in the 14th century. It is derived from the Old French "prose", which in turn originates in the Latin expression "prosa oratio" (literally, straightforward or direct speech).
Prose Edda
A final hypothesis is derived from the Latin ""edo"", meaning "I write". It relies on the fact that the word ""kredda"" (meaning "belief") is certified and comes from the Latin ""credo"", "I believe." It seems likely Snorri would have been able to invent the word. Edda in this case could be translated as "Poetic Art". This is the meaning that the word was then given in the Middle Ages.