Having two spines or spine-like projections, especially used in botanical and zoological descriptions.
From Greek 'dia-' (two) and 'akantha' (thorn/spine), literally 'two-spined.' This technical term emerged in scientific taxonomy during the 18th century.
Many fish and sea creatures use diacanthous features—like paired dorsal spines—as defensive weapons or to appear larger to predators, showing how evolution weaponizes anatomy.
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