Source : Webster's Revised Unabridged Dictionary (1913)

Nullipore \Nul"li*pore\, n. [L. nullus none + porus pope.]
   (Bot.)
   A name for certain crustaceous marine alg[ae] 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}.