A form of cast iron with nodular graphite inclusions, having many industrial applications.

(idiomatic) To lift weights; to engage in weight or strength training.

(derogatory) Characterized by ruthless control

(figuratively, idiomatic) Ruthless and usually unrestricted control. / Symbol of an army's tank or cavalry branch.

Alternative spelling of flatiron

Tasks in progress; involvement in ongoing projects.

(inorganic chemistry) The crystalline salt of trivalent iron and sulfuric acid, Fe₂(SO₄)₃.

(inorganic chemistry) The green, crystalline salt of divalent iron and sulfuric acid, FeSO₄, used as a pigment, and in water treatment.

plural of branding iron

(chemistry) The chemical compound FeO, iron oxide where iron has a valence of +2.