A noun meaning “river” developed from the primitive form ᴹ✶kelun (Ety/KEL), where the [[ilk|final [un] became [on]]].
Conceptual Development: This word was initially marked as Noldorin.
Doriathrin
duil
noun. river
celon
noun. river
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 noun meaning “river”, simply an elaboration of its root ᴹ√DUY (Ety/DUI).