Greek Mythology One who sailed with Jason on the Argo in search of the Golden Fleece.
also argonaut A person who is engaged in a dangerous but rewarding quest; an adventurer.
ETYMOLOGY: From Latin Argonautae, Argonauts, from Greek Argonauts, Argonaut : Arg, the ship Argo + nauts, sailor (from naus, ship; see nu- in Indo-European roots)