triggerfish
/ˈtrɪɡərˌfɪʃ/
noun
- A brightly colored tropical fish with a large spine on its back that it can lock upright as a defense.
- The triggerfish uses its dorsal spine to wedge itself into crevices when threatened.
- While snorkeling, we saw a triggerfish hiding among the coral.
- Aquarium visitors were fascinated by the triggerfish's bright patterns and unusual shape.