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



BrE BrE//ˈbæθɪsfɪə(r)//
; NAmE NAmE//ˈbæθɪsfɪr//
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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