Resembling or characteristic of the family Ceratiidae, the deep-sea anglerfishes.
From Ceratiidae + -oid (resembling/like), following scientific nomenclature for describing similarities to established taxonomic groups.
When biologists find a new anglerfish, they often describe it as 'ceratioid' because there's a whole constellation of weird traits that go together—bioluminescence, parasitic males, and crushing deep-sea adaptations.
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