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hackamore a simple bitless bridle of rope or rawhide with a reinforced noseband and single rope rein which together exert controlling pressure on the nose of a horse, used esp. for training.
hackberry a type of elm tree that bears small, edible, cherrylike fruit. [2 definitions]
hacker a computer user who is able to penetrate carefully protected computer networks, such as those of a government. [2 definitions]
hackie (informal) a taxi driver.
hackle one of the long, thin feathers on the neck or lower back of certain birds, such as the rooster. [3 definitions]
hackmatack a tamarack. [2 definitions]
hackney a horse suited for ordinary riding or driving. [4 definitions]
hackneyed made trite or commonplace by overuse, as an expression or phrase.
hacksaw a saw used to cut metal, with a tough, fine-toothed, short blade fixed in a frame.
had past tense and past participle of have.
had better used to state or warn that something bad might happen if you do not do something; should.
haddock a North Atlantic food fish, related to but smaller than cod.
Hades in Greek mythology, the underworld inhabited by the dead, or the god who rules there; Pluto. [3 definitions]
hadn't contracted form of "had not".
hadron in particle physics, any particle made up of quarks and held together by the strong force.
hadrosaur any dinosaur of the Hadrosauridae family, having a broad, flat snout for grazing; also known as a "duck-billed dinosaur."
haemato- see hemato-.
hafnium a chemical element that has seventy-two protons in each nucleus and that occurs as a tetravalent metal often found in combination with zirconium, used in pure form for applications such as nuclear reactor control rods because it absorbs neutrons well. (symbol: Hf)
haft a handle or hilt, as of a weapon or cutting tool. [2 definitions]
hag an ugly old woman, esp. one considered frightening or wicked. [2 definitions]
Hagar according to the Old Testament, Abraham's concubine and the mother of Ishmael.