Webster’s Revised Unabridged Dictionary · 1913
Argonaut
Ar′go·naut (är′gō·na̤t), n. [L. Argonauta, Gr. Ἀργοναύτης; Ἀργώ + ναύτης sailor, ναῦς ship. See Argo.] 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.