Plural of hemibranch; multiple gill structures with filaments on only one side, found in certain fish species.
Latin plural form of 'hemibranch,' combining Greek 'hemi-' with Latin 'branchia' (gill). This technical term appears in ichthyological literature from the 1800s onward.
When scientists counted hemibranchii in fish specimens, they were literally counting half-gills—a grammatical reminder that evolution works with what it has, sometimes creating beautiful asymmetries that still work perfectly well.
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