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 →

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 →
Scientists found a layer of iridium in rocks all over the world. tree →
That iridium came from an asteroid. tree →
Iridium hardly ever rusts. tree →
The tip of the fountain pen is made with iridium. tree →

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: every meaning and example parsed by Mova, with its dependency tree and frames.
«iridium» in the school dictionary on Mova free.

This page in Markdown → https://md.dictionary.elamur.ai/free/en/english/iridium/