from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. One of the five radial areas on the undersurface of the starfish and similar echinoderms, from which the tube feet are protruded and withdrawn.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A row of pores for the protrusion of appendages such as tube feet.

from the GNU version of the Collaborative International Dictionary of English

  • 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.

from The Century Dictionary and Cyclopedia

  • n. In zoology, a row, series, or other set of perforations in the shell of an echinoderm, as a sea-urchin or starfish, through which are protruded and withdrawn the tube-feet or pedicels.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. one of the five areas on the undersurface of an echinoderm on which the tube feet are located


Latin ambulācrum, walk planted with trees, from ambulāre, to walk.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin ambulacrum, from ambulō ("walk; travel"). (Wiktionary)



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