1. Voyager, traveler: hydronaut.
2. One likened to a voyager: cybernaut.
[From Greek nautēs, sailor, from naus, ship; see nāu- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.