Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “iron”


noun [U] (METAL)   /ˈɑɪ·ərn/
a common , silver-colored, metal element that is magnetic and strong , is used in making steel , and is found in small amounts in blood and in all living things: Iron rusts easily . Liver is a rich source of dietary iron.
(Definition of iron noun (METAL) from the Cambridge Academic Content Dictionary © Cambridge University Press)
Focus on the pronunciation of iron

Definitions of “iron” in other dictionaries

Word of the Day

tie the knot

to get married

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More