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# iridium

«iridium» in Mova's school dictionary: **A very hard, heavy, silvery metal, a chemical element…** — its meaning for a pupil, its sense in the lessons and examples.

### part of speech

noun (iridium — uncountable)

### meaning for a pupil

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

### sense 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://md.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://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x2)
- That iridium came from an asteroid. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x3)
- Iridium hardly ever rusts. [tree →](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/#x4)
- The tip of the fountain pen is made with iridium. [tree →](https://md.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.

### Trees and pragmatics

[Every meaning and example of «iridium» parsed by Mova](https://md.mova.elamur.ai/free/en/corpora/dictionaries/school/I/iridium/), each sentence with its dependency tree and frames.