An (archaic) noun appearing as G. †cim “blade” in the Gnomish Lexicon of the 1910s (GL/26). The noun G. caf “blade” also appeared in the same document, but it was deleted (GL/24).

Neo-Sindarin: The root √KIM “edge, brink of” appeared in Tolkien’s writing of the 1960s, with derivatives like Q. címa “edge of a cutting weapon/tool” (PE22/149). Therefore, I think this Gnomish noun might be retained for purposes of Neo-Sindarin as ᴺS. cim “blade”, perhaps derived from primitive *kimbē. I would also assume this Neo-Sindarin word was not archaic.