anoxic.

Lacking oxygen, or containing so little that a relevant environment or process is treated as oxygen-free.

Use it for

Words that belong together

• an anoxic environment
• anoxic water

On the page

The deeper water was anoxic despite the vegetation along its surface.

Only organisms suited to the anoxic environment persisted in the sealed sample.

Usage notes

Primary category: sci-fi. Forms: Relational adjective; compare degree of resistance or deficiency explicitly rather than forcing a routine superlative. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.