iron

(noun) a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood. Synonyms: Fe, atomic number 26.

(noun) a golf club that has a relatively narrow metal head.

(noun) implement used to brand live stock. Synonyms: branding iron.

(noun) home appliance consisting of a flat metal base that is heated and used to smooth cloth. Synonyms: smoothing iron.

(verb) press and smooth with a heated iron. Synonyms: iron out, press. Examples: "Press your shirts." "She stood there ironing."

(adj) extremely robust. Synonyms: cast-iron. Example: "An iron constitution."