Siderian

//saɪˈdɪəri.ən/ adj, name

adj, name ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Of a geologic period within the Paleoproterozoic era from about 2500 to 2300 million years ago.
Proper Noun
  1. 1
    The Siderian period.

Etymology

From Greek sideros.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.