any echinoderm of the class Holothuroidea, having a long, leathery body with tentacles around the anterior end.
sea cucumber
any echinoderm of the class Holothuroidea, having an elongated body covered with a leathery skin and bearing a cluster of tentacles at the oral end. They usually creep on the sea bed or burrow in sand
sea cucumber
See holothurian.

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