croquis (Fr.), an outline or rough sketch.
croustade (Fr.), a kind of rissole with hard crust.
crux criticorum (L.), a puzzle for the critics.
cucullus non facit monachum (L.), the cowl does not make the monk.
cui bono? (L.), for whose benefit is it? who is the gainer?
cuilibet in arte suâ credendum est (L.), every person is to be trusted in his own art.
culpa levis (L.), a slight fault.
cum bonâ veniâ (L.), with your kind indulgence.
cum grano salis (L.), with a grain of salt—i.e. with some allowance.
cum multis aliis (L.), with many other things.