# Siderian

> English word · Adjective · IPA /saɪˈdɪəri.ən

## Definitions
1. Of a geologic period within the Paleoproterozoic era from about 2500 to 2300 million years ago.

## Etymology
From Greek sideros.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/siderian