The hard skeleton or internal framework that a coral polyp builds and lives in.
From Latin 'corallium,' derived from Greek 'korallion,' possibly from Semitic 'garal.' The term specifically refers to the calcium carbonate structure secreted by individual coral animals.
Coral polyps are tiny animals that work like construction crews—they build the corallum (the hard house) they live in out of limestone they pull from seawater!
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