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Answer for the clue "One of the five areas on the under surface of an echinoderm on which the tube feet are located ", 10 letters:
ambulacrum

Word definitions for ambulacrum in dictionaries

WordNet Word definitions in WordNet
n. one of the five areas on the undersurface of an echinoderm on which the tube feet are located [also: ambulacra (pl)]

Wikipedia Word definitions in Wikipedia
An ambulacrum is an architectural term for the atrium , courtyard , or parvise in front of a basilica that is surrounded by arcades or colonnades , often containing a fountain , and is surrounded by trees. It can also refer to any walking path specifically ...

Wiktionary Word definitions in Wiktionary
n. (context of an echinoderm English) A row of pores for the protrusion of appendages such as tube feet.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Ambulacrum \Am`bu*la"crum\, n.; pl. Ambulacra . [L., an alley or covered way.] (Zo["o]l.) One of the radical zones of echinoderms, along which run the principal nerves, blood vessels, and water tubes. These zones usually bear rows of locomotive suckers ...

Usage examples of ambulacrum.

Finally, the corridor they had taken ended in the ambulacrum behind the columns that encircled the crypt where, the last time, they had seen Zosimos.