Hypertext Webster Gateway: "lungfish"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Lungfish \Lung"fish`\, n. (Zo["o]l.)
Any fish belonging to the Dipnoi; -- so called because they
have both lungs and gills.
From WordNet (r) 1.7 (wn)
lungfish
n : air-breathing fish having an elongated body and fleshy
paired fins; certain species construct mucus-lined mud
coverings in which to survive drought
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