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Webster's Dictionary (1865)

Ăr'go-naut, n.

noun

n. [Lat. Argonauta, Gr. ’Αργοναύτης, from ’Αργώ and ναύτης, Lat. nauta, for navita, a seaman, sailor, from ναῦς, Lat. navis, ship. See ARGO.]

  1. One of the persons who sailed to Colchis with Jason, in the Argo, in quest of the golden fleece.
  2. (Zoöl.) The nautilus. See ARGONAUTA.