What is an argonaut?

In Greek mythology, the Argonauts were a band of heroes who, in the years before the Trojan War, accompanied Jason to Colchis (modern day Georgia) in his quest to find the Golden Fleece. Their name comes from their ship, the Argo, which was named after its builder, Argus. "Argonauts", therefore, literally means "Argo sailors". They were sometimes called Minyans, after a prehistoric tribe of the area.