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plural argonauts
Any of several species of shelled octopods of the family Argonautidae (of which only the genus Argonauta is not extinct). quotations examples
Amazingly, it wasn’t until 2010 that scientists experimentally understood how argonauts use their shell constructions to float in the water column and control buoyancy.
2018 March 27, Mark Carnall, The Guardian
An adventurer on a dangerous but rewarding quest. examples
(specifically, historical) A 49er, a person who took part in the California Gold Rush of 1849.