argonaut Meaning, Definition & Usage

  1. noun someone engaged in a dangerous but potentially rewarding adventure
  2. noun (Greek mythology) one of the heroes who sailed with Jason in search of the Golden Fleece
  3. noun cephalopod mollusk of warm seas whose females have delicate papery spiral shells
    paper nautilus; Argonauta argo; nautilus.

WordNet

Ar"go*naut noun
Etymology
L. Argonauta, Gr. + sailor, ship. See Argo.
Definitions
  1. Any one of the legendary Greek heroes who sailed with Jason, in the Argo, in quest of the Golden Fleece.
  2. (Zoöl.) A cephalopod of the genus Argonauta.

Webster 1913