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Answer for the clue "Class of echinoderms including the sea cucumbers ", 13 letters:
holothuroidea

Word definitions for holothuroidea in dictionaries

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Holothurioidea \Hol`o*thu`ri*oi"de*a\, n. pl. [NL. See Holothure , and -oid .] (Zo["o]l.) One of the classes of echinoderms. Note: They have a more or less elongated body, often flattened beneath, and a circle of tentacles, which are usually much branched, ...

Usage examples of holothuroidea.

Williams had a better view and thought it surely the biggest Holothuroidea in existence.