azoic
/eɪˈzoʊɪk/
adjective
- Having no living organisms; lifeless, especially in reference to ancient geological periods before life existed.
- Some deep ocean trenches were once thought to be azoic, but life was found there.
- Geologists study azoic rock layers that contain no fossils.
- The azoic era on Earth ended when the first simple life forms appeared.
Antonyms