noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A habitable planet that has a surface temperature of −50 to 0°C (colder than is optimal for most terrestrial life), such as Mars.

Synonyms

All synonyms

mesoplanetthermoplanet

Etymology

From psychro- + planet.

Related phrases

habitable planet

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