An organism, especially a fish, that breathes using two lungs or has dual air-breathing organs.
From Greek 'diplos' (double) and 'pneuma' (air), used in biology to describe animals with double breathing mechanisms, particularly lungfish.
Lungfish are the classic dipneusts—they're living fossils that can breathe air when their water dries up, and they're our ancient cousins in the evolutionary path toward all land vertebrates.
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