noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   The portion of the atmosphere from sea-level to about 4000 meters in which it is possible to breathe without technological assistance.
2. 2
   The biosphere.

Synonyms

All synonyms

aerosphereall that livesatmospherebiochorebiocyclebiosphere

Etymology

From eco- + -sphere.