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Comprehensive
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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 that a certain action is strongly advised and, often, to express that if one does not do the action that is specified, there will be negative consequences (sometimes used in warnings and threats).
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.
hagfish a small eellike marine fish with horny teeth and a round, jawless, sucking mouth.
Haggadah a book read at the Passover Seder that contains the story of Exodus and the ritual of the Seder. [2 definitions]