brain coral

noun
any of several reef-building corals of the genus Meandrina, having a highly convoluted and furrowed surface.

Origin:
1700–10

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World English Dictionary
brain coral
 
n
a stony coral of the genus Meandrina, in which the polyps lie in troughlike thecae resembling the convoluted surface of a human brain

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Healthy brain coral colony surrounded by typical reef soft corals and macro algae.
Shallower portions of the sanctuary are dominated by large, boulder-shaped coral such as brain coral and mountainous star corals.
Broken brain coral and rubble resulting from the grounding.
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