: any of a class (Holothurioidea) of echinoderms having a tough muscular elongated body with tentacles surrounding the mouth
called alsoholothurian
Illustration of sea cucumber
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Some of the specimens look highly similar to cambroernids—animals that looked vaguely similar to modern-day sea cucumbers—which have previously only been dated to the Cambrian.—Jackie Flynn Mogensen, Scientific American, 2 Apr. 2026 Bêche-de-mer (trepang, or sea cucumber) fishing also drew outsiders to the Torres Strait.—Britannica Editors, Encyclopedia Britannica, 19 Mar. 2026 The sea cucumber beside her stone is orange.—Literary Hub, 23 Feb. 2026 Every few minutes Baya would dive down to point out a foot-long sea cucumber, or a cluster of blue, black, and yellow sea stars scattered on the seabed.—Flora Stubbs, Travel + Leisure, 7 Feb. 2026 See All Example Sentences for sea cucumber
: 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