Relating to or characteristic of crinoids; resembling or containing crinoid fossils or parts.
From 'crinoid' (Greek 'krinon' + '-oid') plus the adjectival suffix '-al,' which converts nouns into adjectives meaning 'relating to' or 'characteristic of.'
Geologists and paleontologists use '-al' adjectives constantly to describe rock types: limestone is 'crinoidal' if it contains abundant crinoid fragments, making it easy to spot ancient sea environments in rock formations.
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