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| am·bu·lac·rum [ àmbyə láykrəm ] (plural am·bu·lac·ra [ àmbyə láykrə ]) |
noun |
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| Definition: |
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part of echinoderm: in a starfish, sea urchin, or similar animal, each of the five radial areas on the underside of the body along which the blood vessels and nerves run and through which the feet extend
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| [Early 19th century. < Latin, "avenue" < ambulare "to walk"] |
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 am·bu·lac·ral adjective |
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