Hycean
//ˈhaɪʃən// adj
adj ·Rare ·Advanced level
Definitions
Adjective
- 1 Having a water-based ocean that covers the entire planet, and an atmosphere rich in hydrogen. neologism, not-comparable
"With densities between those of rocky super-Earths and more extended mini-Neptunes, Hycean planets can be optimal candidates in the search for exoplanetary habitability and may be abundant in the exoplanet population."
Example
More examples"With densities between those of rocky super-Earths and more extended mini-Neptunes, Hycean planets can be optimal candidates in the search for exoplanetary habitability and may be abundant in the exoplanet population."
Etymology
Blend of hydrogen + ocean. Coined in 2021.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.