
1) Architectural element 2) Body part
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https://www.crosswordclues.com/clue/ambulacrum

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 created with trees. ...
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http://en.wikipedia.org/wiki/Ambulacrum
[anatomy] In zoology, an ambulacrum is an elongated area of the shell of an echinoderm in which a row of tube feet are arranged. It is pluralized as ambulacra. The area on the shell between ambulacra is known as an interambulacrum. ...
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http://en.wikipedia.org/wiki/Ambulacrum_(anatomy)

• (n.) 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 or tentacles, which protrude from regular pores. In star fishes they occupy the grooves along the under side of the rays. • (n.) One of the suckers on the feet of mites.A...
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http://thinkexist.com/dictionary/meaning/ambulacrum/

Origin: L, an alley or covered way. ... <zoology> 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 or tentacles, which protrude from regular pores. In star fishes they occupy the grooves along the under side of the rays. ... One o...
Found on
http://www.encyclo.co.uk/local/20973
Am`bu·la'crum noun ;
plural Ambulacra [ Latin , an alley or covered way.]
(Zoology) (a) 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 or tentacles, wh...
Found on
http://www.encyclo.co.uk/webster/A/68

[
n] - one of the five areas on the under surface of an echinoderm on which the tube feet are located
Found on
http://www.webdictionary.co.uk/definition.php?query=ambulacrum

ambulacrum One of the five radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.
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http://www.wordinfo.info/words/index/info/view_unit/578/
noun one of the five areas on the undersurface of an echinoderm on which the tube feet are located
Found on
https://www.encyclo.co.uk/local/20974

one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.
Found on
https://www.infoplease.com/dictionary/ambulacrum
No exact match found.