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hydrobarometer
hydrobarometer n.
Brit. 
/ˌhʌɪdrə(ʊ)bəˈrɒmᵻtə/
, /ˌhʌɪdrə(ʊ)bəˈrɒmᵻtə/U.S. /ˌhaɪdroʊbəˈrɑmədər/
an instrument for determining the depth of the ocean from the pressure of the superincumbent water (Webster 1864)./ˌhaɪdroʊbəˈrɑmədər/<
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