Venomous tropical marine fish resembling a piece of rock WordNet 3.0 & Open English WordNet

Synanceia verrucosa, the reef stonefish or simply stonefish, is a species of venomous, marine ray-finned fish, belonging to the subfamily Synanceiinae which is classified as being within the family Scorpaenidae, the scorpionfishes and their relatives. Wikipedia

A venomous tropical marine fish resembling a piece of rock, of the genus Synanceia, found in the Indian Ocean and Pacific Ocean. Wiktionary

Tropical marine fish. Wiktionary (translation)