Early Quenya
rinqa
adjective. round, circular; revolving, returning, recurrent
korima
adjective. round
werin(a)
adjective. round
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!
An adjective appearing as ᴱQ. rinqa in the Qenya Lexicon of the 1910s glossed “round, circular; revolving, returning, recurrent” and based on the early root ᴱ√RINI having to do with circles (QL/80).
Neo-Quenya:For purposes of Neo-Quenya I would use the later word ᴹQ. rinda for “circular”, but I would retain ᴺQ. rinqua for the meanings “revolving, returning, recurrent”, originally of the sense “✱moving in a circle”.