Akademik

oceanic abyss

noun

a long steep-sided depression in the ocean floor

• Syn: ↑trench, ↑deep

• Hypernyms: ↑natural depression, ↑depression

• Instance Hyponyms: ↑Atacama Trench, ↑Bougainville Trench, ↑Japan Trench, ↑Nares Deep

Useful english dictionary. 2012.