coralline

Short definition from Wiktionary

Adjective

1. 1
   Of, relating to or pertaining to or resembling red algae of the family Corallinaceae.
2. 2
   Of, pertaining to, or resembling the material coral.
3. 3
   Describing rock formed from the skeletons of such algae.

Noun

1. 1
   Any calcareous species of red algae of the family Corallinaceae.
2. 2
   An animal that resembles such a coral.