Cryogenian

adj, name

adj, name ·Rare ·Advanced level

Definitions

Adjective
  1. 1
    Of a geologic period within the Neoproterozoic era from about 850 to 600 million years ago.
Proper Noun
  1. 1
    The Cryogenian period.

Etymology

From cryogenic (“of low temperature”) + -ian.

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