Merriam-Webster Collegiate Dictionary - coralline

 I. noun  Date: 1543  1. a ~ red alga  2. a bryozoan or hydroid that resembles a coral  II. adjective  Etymology: French, from feminine of corallin coral-like, from Middle French, from Late Latin corallinus, from Latin corallium  Date: circa 1633  1. of, relating to, or resembling coral  2. of, relating to, or being any of a family (Corallinaceae) of calcareous red algae