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HYDROLANT

[hahy-druh-lant]
noun
  1. an urgent warning of navigational dangers in the Atlantic Ocean, issued by the U.S. Navy Hydrographic Office.
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Origin of HYDROLANT

hydro-1 + (At)lant(ic)
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018