Early Quenya
tyuru-
verb. to ‘turn’ milk, curdle (blood etc.)
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 verb appearing as ᴱQ. tyuru- in the Qenya Lexicon of the 1910s with the gloss “to ‘turn’ milk, curdle (blood etc.)” derived from the early root ᴱ√TYURU “curdle” (QL/50). The form Q. tyuru- is also mentioned in the contemporaneous Gnomish Lexicon of the 1910s as related to G. cûr “cheese”, but it isn’t clear whether this is a reference to the verb or the root (GL/28).
Neo-Quenya: I’d retain ᴺQ. tyur- “curdle” for purposes of Neo-Quenya, derived from a Neo-Root ᴺ√KYUR.