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View synonyms for H-hour

H-hour

[ eych-ouuhr, -ou-er ]

noun

, Military.
  1. the time, usually unspecified, set for the beginning of a planned attack.


H-hour

noun

  1. military the specific hour at which any operation commences Also calledzero hour
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of H-hour1

First recorded in 1918; H (for hour ) + hour; D-day
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Example Sentences

We breathed the standard helium-oxygen mix at normal pressure until about four hours before H-hour.

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