sea cucumber

noun

: any of a class (Holothurioidea) of echinoderms having a tough muscular elongated body with tentacles surrounding the mouth

called also holothurian

Illustration of sea cucumber

Examples of sea cucumber in a Sentence

Recent Examples on the Web

Feeding and living on the carcasses were myriad creatures, large and small, including sea cucumbers, squat lobsters and saltwater clams. —Adithi Ramakrishnan, Los Angeles Times, 14 June 2026

Feeding and living on the carcasses were myriad creatures, large and small, including sea cucumbers, squat lobsters and saltwater clams. —ABC News, 10 June 2026

Scientists hoping to stop the illicit trade of marine wildlife have a new tool to spot seahorses, shark fins and sea cucumbers hidden in luggage. —Jackie Flynn Mogensen, Scientific American, 7 June 2026

In the surrounding abyss, scientists have found mollusks, snails, worms, sea cucumbers, isopods, starfish and more. —Harry Stevens, New York Times, 3 June 2026

Word History

First Known Use

1841, in the meaning defined above

Kids Definition

sea cucumber

noun

: any of a class of invertebrate sea animals that are echinoderms with a long tough flexible muscular body resembling a cucumber and having tentacles surrounding the mouth at one end