NULLIPORE

Etymology

Noun

nullipore (plural nullipores)

Any of various crustaceous marine algae which secrete calcium carbonate.

Source: Wiktionary

Nul"li*pore, n. Etym: [L. nullus none + porus pope.] (Bot.)

Definition: A name for certain crustaceous marine algæ 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.

Source: Webster’s Unabridged Dictionary 1913 Edition