ambulacrum Meaning, Definition & Usage

  1. noun one of the five areas on the undersurface of an echinoderm on which the tube feet are located

WordNet

Am`bu*la"crum noun
Etymology
L., an alley or covered way.
Wordforms
plural Ambulacra
Definitions
  1. (Zoöl.) (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, which protrude from regular pores. In star fishes they occupy the grooves along the under side of the rays. (b) One of the suckers on the feet of mites.

Webster 1913