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The definition of iron

17 Definitions of: iron

1. noun, a) a malleable ductile silvery-white ferromagnetic metallic element occurring principally in haematite and magnetite. It is widely used for structural and engineering purposes. See also steel, cast iron, wrought iron, pig iron. Symbol: Fe; atomic no: 26; atomic wt: 55.847; valency: 2,3,4, or 6; relative density: 7.874; melting pt: 1538°C; boiling pt: 2862°C. Related adjs ferric, ferrous. Related prefix ferro- b) (as modifier)
2. noun, any of certain tools or implements made of iron or steel, esp for use when hot
3. noun, an appliance for pressing fabrics using dry heat or steam, esp a small electrically heated device with a handle and a weighted flat bottom
4. noun, any of various golf clubs with narrow metal heads, numbered from 1 to 9 according to the slant of the face, used esp for approach shots
5. noun, an informal word for harpoon
6. noun, slang a splintlike support for a malformed leg
7. noun, great hardness, strength, or resolve
8. noun, astronomy. short for iron meteorite
9. noun, See shooting iron
10. noun, strike while the iron is hot to act at an opportune moment
11. adjective, very hard, immovable, or implacable
12. adjective, very strong; extremely robust
13. adjective, cruel or unyielding
14. adjective, an iron fist a cruel and unyielding attitude or approach. See also velvet
15. verb, to smooth (clothes or fabric) by removing (creases or wrinkles) using a heated iron; press
16. verb, to furnish or clothe with iron
17. verb, to place (a prisoner) in irons ▷ See also iron out ▷ See also, irons
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Synonyms:	irony, inflexible, hard, strong, tough, steel, rigid, adamant, unconditional, steed	And more...
Antonyms:	weak

From Collins