Organ-pipe coral

Also found in: Wikipedia.
Related to Organ-pipe coral: brain coral, Fire coral
(Zool.) See Tubipora.

See also: Organ

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The blush color comes from billions of pieces of crushed red organ-pipe coral, seen in every handful of sand,' Nat Geo said.