In zoology, a secondary or second dome-like structure, particularly referring to the second of paired symmetrical structures in invertebrate animals.
From deutero- (second) + -dome (from Greek 'domos' meaning 'house' or 'building'). This technical term appears in taxonomic descriptions of animal anatomy.
Nature loves symmetry and repetition—many sea creatures have paired structures arranged in a pattern, and naming them in order (proto-, deutero-) helps scientists communicate exactly which part they're studying.
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