Middle Primitive Elvish
lătĭna
adjective. flat (and wide)
ed(er)
root. open
pantā
adjective. open
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
A deleted root in The Etymologies of the 1930s with the gloss “open” and the forms √ED and extended √EDÉR, but it had no derivatives (EtyAC/ED).