A zoological classification referring to animals with a firmly fused breastbone structure, particularly used in studying bird anatomy.
New Latin compound: 'firmi-' from Latin firmus (firm) + 'sterna' from Latin sternum (breastbone). Created in 19th-century scientific taxonomy to describe anatomical features.
Taxonomists invented this term to categorize birds based on their chest bone structure—some birds have flexible sternums and others have rigid ones, which affects how they fly and move.
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