ambulacrum
American Heritage Dictionary:
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am·bu·lac·rum
(ăm'byə-lăk'rəm, -lā'krəm) 
n., pl., -lac·ra (-lăk'rə, -lā'krə).
One of the five radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.
n., pl., -lac·ra (-lăk'rə, -lā'krə).
One of the five radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.
[Latin ambulācrum, walk planted with trees, from ambulāre, to walk.]
ambulacral am'bu·lac'ral adj.
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1. Atrium, court, or parvis, sometimes with a fountain in the centre, surrounded by arcades or colonnades, and often planted with trees, in front of a basilica.
2. Any walk or avenue with formally arranged tree-planting.
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American Heritage Dictionary
The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
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