What is the meaning of Ambulacra?

(pl.) of Ambulacrum.
Webster's Revised Unabridged Dictionary
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APAWebster's. (2011). ambulacra. Retrieved September 23, 2026, from http://smartdefine.org/ambulacra/definitions/1973019
ChicagoWebster's. 2011. "ambulacra" http://smartdefine.org/ambulacra/definitions/1973019 (accessed September 23, 2026).
HarvardWebster's 2011, ambulacra, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/ambulacra/definitions/1973019>.
MLAWebster's. "ambulacra" 27 May 2011. Web. 23 September 2026. <http://smartdefine.org/ambulacra/definitions/1973019>