1. Symbol Fe A silvery-white, lustrous, malleable, ductile, magnetic or magnetizable, metallic element occurring abundantly in combined forms, notably in hematite, limonite, magnetite, and taconite, and used alloyed in a wide range of important structural materials. Atomic number 26; atomic weight 55.845; melting point 1,538°C; boiling point 2,861°C; specific gravity 7.874 (at 20°C); valence 2, 3, 4, 6. See Periodic Table.

2. An implement made of iron alloy or similar metal, especially a bar heated for use in branding, curling hair, or cauterizing.

3. Great hardness or strength; firmness: a will of iron.

4. Sports Any of a series of golf clubs having a bladelike metal head and numbered from one to nine in order of increasing loft.

5. A metal appliance with a handle and a weighted flat bottom, used when heated to press wrinkles from fabric.

6. A harpoon.

7. irons Fetters; shackles.

8. A tonic, pill, or other medication containing iron and taken as a dietary supplement.

1. Made of or containing iron: iron bars; an iron alloy.

2. Strong, healthy, and capable of great endurance: an iron constitution.

3. Inflexible; unyielding: iron resolve.

4. Holding tightly; very firm: has an iron grip.

2. To put into irons; fetter.

3. To fit or clad with iron.