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aquanaut (n.)

1881, "underwater explorer," in a futuristic novel, from aqua- "water" + ending from Greek nautes "sailor" (from PIE root *nau- "boat").

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Definitions of aquanaut

aquanaut (n.)
an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder;
Synonyms: skin-diver
aquanaut (n.)
a skilled worker who can live in underwater installations and participate in scientific research;
Synonyms: oceanaut
From wordnet.princeton.edu