Lacking gills or gill structures; describing organisms without branchia or gills.
From Greek 'a-' (without) + 'branchia' (gills). A scientific term combining the negation prefix with the anatomical term for gills.
Some aquatic animals are abranchial—they breathe through their skin or lungs instead—which seems impossible for water creatures, but it works brilliantly for certain salamanders and snails.
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