leghorn UK /ˈlɛɡhɔːn/US /ˈlɛɡhɔɹn/ noun3 •A small white chicken of a hardy breed. •A type of hat made from Leghorn straw.When straw-hats had become unfashionable, Mrs. Nollekens hinted to old White, the hatter […], that possibly he could accommodate her with a Leghorn hat at a moderate rate. — 1828 •A type of dried plaited wheat straw fabric. formsLeghorns · leghorns