Having two lungs, or capable of breathing air from two different sources (used in biology and fantasy contexts).
From 'double' plus 'lunged' (from Latin 'pulmo' for lung). Most mammals have two lungs, making this a somewhat technical or descriptive term used mainly in specialized contexts.
Scientists invented this term to describe certain prehistoric fish and amphibians that could actually breathe air directly—they literally had two lungs developing, making them the evolutionary bridge between water and land animals.
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