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ambulacrum

noun
am·​bu·​la·​crum | \-krəm \
plural ambulacra\-​krə \

Definition of ambulacrum 

: an ambulacral area or part

First Known Use of ambulacrum

1802, in the meaning defined above

History and Etymology for ambulacrum

New Latin, from Latin, alley, from ambulare to walk — more at amble

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The first known use of ambulacrum was in 1802

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