Forsooth! I can't find what you're looking for!

The word ?skal applied to more opaque things that cut off light and cast hasn't been recorded for any of the languages.

Black Speech, Nandorin, Noldorin, Quendya, Quenya, Sindarin, Telerin are languages conceived by Tolkien and they do not belong to us; we neither can nor do claim affiliation with Middle-earth Enterprises nor Tolkien Estate.