coralline
cor·al·line / ˈkôrəˌlīn/ • n. (also coralline alga or coralline seaweed) a branching reddish seaweed (family Corallinaceae) with a calcareous stem, in particular Corallina officinalis, common on the coasts of the North Atlantic. ∎ a sedentary colonial marine animal, esp. a bryozoan.• adj. chiefly Geol. derived or formed from coral. ∎ of the pinkish-red color of precious red coral. ∎ resembling coral: coralline sponges.
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coralline
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coralline