The Collaborative International Dictionary
Trepang \Tre*pang"\, n. [Malay tr[=i]pang.] (Zo["o]l.) Any one of several species of large holothurians, some of which are dried and extensively used as food in China; -- called also b[^e]che de mer, sea cucumber, and sea slug. [Written also tripang.]
Note: The edible trepangs are mostly large species of Holothuria, especially Holothuria edulis. They are taken in vast quantities in the East Indies, where they are dried and smoked, and then shipped to China. They are used as an ingredient in certain kinds of soup.
Wikipedia
Holothuria edulis, commonly known as the edible sea cucumber or the pink and black sea cucumber, is a species of echinoderm in the family Holothuriidae. It was placed in the subgenus Halodeima by Pearson in 1914, making its full scientific name Holothuria (Halodeima) edulis. It is found in shallow water in the temperate and tropical western part of the Indo-Pacific Ocean.