ambulacrum

[am-byuh-lak-ruhm, -ley-kruhm]

am·bu·lac·rum

[am-byuh-lak-ruhm, -ley-kruhm]
noun, plural am·bu·lac·ra [-lak-ruh, -ley-kruh] .
one of the radial areas in an echinoderm, as the sea urchin, bearing the tube feet by which the creature moves.

Origin:
1830–40; < Neo-Latin, Latin: alley, walking place, equivalent to ambulā- (stem of ambulāre to walk) + -crum noun suffix denoting means

am·bu·lac·ral, adjective
in·ter·am·bu·la·crum, noun, plural in·ter·am·bu·la·cra.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Ambulacrum is always a great word to know.
So is gobo. Does it mean:
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Collins
World English Dictionary
ambulacrum (ˌæmbjʊˈleɪkrəm)
 
n , pl -ra
any of five radial bands on the ventral surface of echinoderms, such as the starfish and sea urchin, on which the tube feet are situated
 
[C19: from Latin: avenue, from ambulāre to walk]
 
ambu'lacral
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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