[Elamur Dictionary](https://md.dictionary.elamur.ai/free/en/) · [this page in HTML](https://dictionary.elamur.ai/free/en/english/iridium/)

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# iridium

noun (iridium — uncountable)

«iridium» in the English dictionary: everyday — its meanings, how the lessons use it, and examples, each with its tree on Mova.

## Everyday

A very hard, heavy, silvery metal, a chemical element (symbol Ir), which hardly rusts or wears away. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#m1)

### In the lessons

In science lessons iridium is famous because a thin layer rich in iridium around the world, laid down about 66 million years ago, helped scientists infer that a huge asteroid hit the Earth when the dinosaurs died out. It is used in spark plugs and pen nibs. Phrases: «iridium layer».

### Examples

- Iridium is one of the densest metals on Earth. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x1)
- Scientists found a layer of iridium in rocks all over the world. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x2)
- That iridium came from an asteroid. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x3)
- Iridium hardly ever rusts. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x4)
- The tip of the fountain pen is made with iridium. [tree →](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x5)

### Note

Uncountable. Symbol Ir. Named from «iris» (rainbow) because its salts are many colours.

## On Mova

- [Trees and pragmatics of «iridium» in the school dictionary](https://mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/): every meaning and example parsed by Mova, with its dependency tree and frames.
- [«iridium» in the school dictionary](https://mova.elamur.ai/free/en/dictionaries/school/w/iridium.html) on Mova free.