Relating to or belonging to crinoids; a member or individual of the crinoid group.
From 'Crinoidea' (the taxonomic class) plus the suffix '-an,' which creates adjectives and nouns meaning 'relating to' or 'belonging to,' similar to how 'American' derives from 'America.'
The '-an' suffix is incredibly productive in English for creating group memberships: Californian, politician, reptilian—so 'crinoidean' follows a familiar pattern to describe things related to the crinoid class.
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