cremorne bolt

[kri-mawrn]

noun

(on a French window or the like) a pair of rods, moved by a knob mechanism, sliding into sockets in the head and sill of the opening to provide a secure fastening.

Also cre·mone bolt

[kri-mohn] /krɪˈmoʊn/.

Origin of cremorne bolt

< French crémone, probably after Cremona