English
lungfish
From lung + fish.
Proto-Indo-European *h₁lengʷʰ- ‘to move lightly, effortlessly’
Proto-Germanic *lungô ‘the light organ, lung’
Proto-Germanic *lunganjō
Old English lungen
Middle English lunge
English lung
Proto-Indo-European *piskós
Proto-Germanic *fiskaz
Proto-West Germanic *fisk
Old English fisċ
Middle English fisch ‘an animal that inhabits the water or the meat…’
English fish
Today it means
noun An air-breathing fish, of the class Dipnoi, that have four limblike appendages instead of fins
Language periods are conventional ranges, not dates for this word.
Etymograph / lungfish