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HYDROPAC

American  
[hahy-druh-pak] / ˈhaɪ drəˌpæk /

noun

  1. an urgent warning of navigational dangers in the Pacific Ocean, issued by the U.S. Navy Hydrographic Office.

Etymology

Origin of HYDROPAC

hydro- 1 + Pac(ific) ( def. )

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.