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am·bu·la·crum | \ ˌam-byə-ˈla-krəm 
, -ˈlā- \
, -ˈlā- \ plural ambulacra\ ˌam-byə-ˈla-krə , -ˈlā- \
, -ˈlā- \Definition of ambulacrum
: an ambulacral area or part
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The first known use of ambulacrum was in 1802
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