A primitive form in the Gnomish Lexicon of the 1910s with derivatives meaning “day” (GL/38). There were a variety of different roots for “day” in later writings such ᴹ√AR or √UR.
Early Primitive Elvish
kala
root. *grow
kṇðṇ
root. shine
kṇřṇ
root. shine
ðana
root. day
A root in the Qenya Lexicon of the 1910s given as ᴱ√KṆŘṆ “shine” with derivatives in both Qenya and Gnomish, such as ᴱQ. kanda- “blaze”, G. cintha- “to light, set alight”, ᴱQ. kanwa “lurid”, and G. cantha “flame” (QL/47; GL/25-26). It may be a variant of ᴱ√KṚN “✱red” (QL/48). There are no signs of this root in Tolkien’s later writing.