Definition of bathysphere noun from the Oxford Advanced Learner's Dictionary

 

bathysphere

 noun
noun
BrE BrE//ˈbæθɪsfɪə(r)//
 
; NAmE NAmE//ˈbæθɪsfɪr//
 
 
jump to other results
a round container in which a person can be carried down to the deep ocean, usually used for scientific study Word Origin 1930s: from Greek bathus ‘deep’ + sphere.
See the Oxford Advanced American Dictionary entry: bathysphere