coquille

n. [ F. ] Lit., a shell; hence: (a) A shell or shell-like dish or mold in which viands are served. (b) The expansion of the guard of a sword, dagger, etc. (c) A form of ruching used as a dress trimming or for neckwear, and named from the manner in which it is gathered or fulled. [ Webster 1913 Suppl. ]