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AMBULACRUM
Origin: L, an alley or covered way.
One of the radical zones of echinoderms, along which run the principal nerves, blood vessels, and water tubes. These zones generally bear rows of locomotive suckers or tentacles, which protrude from regular pores. In star fishes they occupy the grooves along the underside of the rays.
One of the suckers on the foots of mites.
Source: Websters Vocabulary