stony coral

noun
a true coral consisting of numerous anthozoan polyps embedded in the calcareous material that they secrete.

Origin:
1610–20

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World English Dictionary
stony coral
 
n
any coral of the order Madreporaria, having a calcareous skeleton, aggregations of which form reefs and islands

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Twenty-eight species of stony coral are reported, and branching corals are common.
Marine scientists observed significant declines in stony coral cover and increases in diseases, and users perceived the decline.
It seemed to him that there appears to be misapprehension that a stony coral genome would be the first cnidarian to be sequenced.
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