Definify.com
Webster 1913 Edition
Argonaut
1.
Any one of the legendary Greek heroes who sailed with Jason, in the Argo, in quest of the Golden Fleece.
2.
(Zool.)
A cephalopod of the genus Argonauta.
2.
One of those who went to California in search of gold shortly after it was discovered there in 1848.
[U. S.]
Bret Harte.
Webster 1828 Edition
Argonaut
ARGONAUT
,Noun.
One of the persons who sailed to Colchis with Jason, in the Argo, in quest of the golden fleece.