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From The Collaborative International Dictionary of English v.0.48:
Nullipore \Nul"li*pore\, n. [L. nullus none + porus pope.] (Bot.) A name for certain crustaceous marine algae which secrete carbonate of lime on their surface, and were formerly thought to be of animal nature. They are now considered corallines of the genera Melobesia and Lithothamnion. [1913 Webster]