deep-sea fish
nounUK /ˌdiːp siː ˈfɪʃ/
US /ˌdiːp siː ˈfɪʃ/
A deep-sea fish is a fish that lives far down in the dark, cold part of the ocean.
The anglerfish is a deep-sea fish that has a glowing lure on its head.
RELATED WORDS
OTHER MEANINGS
2. Any fish that lives in the deeper layers of the sea, usually below the sunlight zone.
Scientists used a camera to film deep-sea fish near the bottom of the trench.
3. A fish adapted to high pressure, cold water, and total darkness.
Deep-sea fish often have big eyes and slow metabolisms.
4. Informally, a person or thing that is mysterious and hard to find.
That rare book is like a deep-sea fish—almost nobody has seen it.