bathythermograph

noun
bathy·ther·mo·graph | \ˈba-thi-ˈthər-mə-ˌgraf \

Definition of bathythermograph 

: an instrument designed to record water temperature as a function of depth

First Known Use of bathythermograph

1938, in the meaning defined above

History and Etymology for bathythermograph

bathy- + thermograph

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The first known use of bathythermograph was in 1938

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