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how-to (informal) providing basic directions and instructions for doing or making something.
how've (informal) contracted form of "how have".
hoyden a girl or young woman who has a rowdy, outspoken, or boisterous manner. [2 definitions]
Hoyle a popular instruction and rule book, esp. for card games, the first edition of which was written by Edmond Hoyle in the eighteenth century.
hp abbreviation of "horsepower," a unit of energy equal to 746 watts or 550 foot-pounds per second, used in measuring the power of engines.
HQ abbreviation of "headquarters."
HR an abbreviation for human resources.
hr. abbreviation of "hour" or "hours," a unit of time equal to sixty minutes.
HRH abbreviation of "Her Royal Highness" or "His Royal Highness."
H.S. abbreviation of "High School," a school consisting of grades nine or ten through twelve or, formerly, grades seven through twelve (used in a proper name).
HST abbreviation of "Hawaiian-Aleution Standard Time," the standard time used in Hawaii and the Aleutian Islands, ten hours behind Greenwich time.
ht. abbreviation of "height."
html abbreviation of "hypertext markup language," a computer language used to create documents on the World Wide Web.
HUAC abbreviation of "House Un-American Activities Committee," a committee of the U.S. House of Representatives (1938-75) created to investigate organizations and individual Americans suspected of being subversive or disloyal to the country.
Huang He a major river originating in the mountains of western China and flowing mostly eastward toward the Bohai Sea; Yellow River.
Huang He River a major river originating in the mountains of western China and flowing mostly eastward toward the Bohai Sea; Yellow River.
huarache a flat Mexican sandal characterized by an upper made of woven leather strips.
hub the rotating center part of a wheel or similar device to which other parts, such as spokes, are connected. [2 definitions]
Hubbard squash a winter squash that has a yellow or green rind and yellow flesh.
hubbub a confusing mix of loud sounds, esp. voices; uproar. [2 definitions]
hubby (informal) husband.