Relating to or belonging to the class Asteroidea (starfish and sea stars).
From Asteroidea (the taxonomic class) plus the adjective-forming suffix -an. This creates a formal biological adjective describing anything pertaining to starfish.
Adding '-ean' to scientific class names is a standard way to create adjectives—it's like how 'mammalian' comes from 'Mammalia'—showing how organized scientific terminology really is.
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