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madreporite

(ma′drə pôr′īt′)

noun

a porous calcareous plate in most echinoderms, through which the sea enters the water-vascular system

Origin: madrepore + -ite

See madreporite in American Heritage Dictionary 4

noun

A perforated platelike structure in most echinoderms that forms the intake for their water-vascular systems.

Origin:

Origin: So called because the perforations resemble those of a madrepore

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