Plural of ambulacrum; the grooved or tube-bearing areas on starfish and sea urchins through which tube feet extend for movement.
From Latin 'ambulacrum' (walking space), formed from 'ambulare' (to walk). The zoological term describes the pathways where these sea creatures extend their tubular feeding and moving appendages.
Starfish move using thousands of tiny tube feet that poke out through these grooves like a living conveyor belt—it's such a weird system that when scientists first discovered it, they named it after walking paths!
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