You searched for: “bathyspheres
bathysphere (s) (noun), bathyspheres (pl)
A round watertight diving chamber with observation windows: A bathysphere was usually lowered by cables from a ship and it was formerly used to study deep-sea life.

The bathysphere is also described as a circular tethered metal compartment with an inside diameter of less than three feet in which the deep-sea pioneers cramped themselves for several hours during each immersion.

A kind of diving globe or ball for deep-sea observations.
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This entry is located in the following units: batho-, bathy- (page 4) sphero-, spher-, -sphere- (page 5)