Tolkien gave the roots √KIN and √KIT with the gloss “small” in Notes on Names (NN) from 1957; given Sindarin derivative S. cidinn, √KIT is the likelier of the two possibilities (PE17/157).

Neo-Eldarin: For purposes of Neo-Eldarin, I recommend against using the Quenya derivative of this root, as there are other better-known Quenya words for “small”. In Sindarin, however, we have fewer options, and I think it is worth retaining this root for that branch of the Eldarin languages.