A derivative of √KUR “skill” in notes from the late 1960s with a difficult-to-read gloss, apparently “a skilful (?device)” according to Carl Hostetter (VT41/10).
Quenya
curo
skillful [?device - tolkien's handwriting was illegible]
curo
noun. skillful (?device)
curu
skill
curu noun "skill" in names like Curufinwë (q.v.) and Sindarin Curufin, Curunir. (SA; possibly the same as curo, curu- above but there was a word curu ["k"] in Tolkien's early "Qenya", glossed "magic, wizardry" [LT1:269]).
curu
noun. skill, skill; [ᴱQ.] magic, wizardry
In Tolkien’s later writing, this word mostly functions as a reduced form of Q. curwë “skill” used as an element in some Quenya names such as Q. Curufinwë and Q. Curumo.
Conceptual Development: In the Qenya Lexicon and Poetic and Mythological Words of Eldarissa of the 1910s ᴱQ. kuru was glossed “magic, wizardry”, and Tolkien further specified that it was used “of the good magic” (QL/49; PME/49). See S. curu for a discussion of the applicability of this word to “magic”.
curo (curu-) noun "a skillful [?device - Tolkien's handwriting was illegible]". (VT41:10)