cú ("k")noun "arch, crescent" (KU3); "crescent Moon" (LT1:271; the long vowel was denoted by a circumflex rather than an accent in the early "Qenya" lexicon). In Sindarin, the same word can be used for a "bow" as used to shoot arrows (but possibly this is only quinga in Quenya).
Noldorin
cúran
noun. crescent moon
cû
noun. arch, crescent
cúran
noun. the crescent Moon
cû
noun. arch, crescent
cû
noun. bow
peng
noun. bow (for shooting)
A word appearing in The Etymologies of the 1930s as N. cûran “crescent moon”, a combination of N. cû “crescent” and N. Rhân “moon” < ᴹ✶Ranā (Ety/KUƷ, RAN). In The Etymologies as published in The Lost Road, Christopher Tolkien gave the form as cúran, but according to Carl Hostetter and Patrick Wynne the actual form was cûran (EtyAC/KUƷ).
Neo-Sindarin: If adapted to Neo-Sindarin, this word would probably become ᴺS. cúron, analogous to S. cýron “new-moon” (VT48/7), with S. Raun < ✱rānā reduced to -ron as usual in polysyllables.