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hyoscine

(Encyclopedia) hyoscine hī´ōsēn, –sĭn [key]: see scopolamine .

Hypatia

(Encyclopedia) Hypatia hīpā´shə [key], d.415, Alexandrian Neoplatonic philosopher and mathematician, a woman renowned for her learning, eloquence, and beauty. Little is known of her writings. Her fame is...

hyperactivity

(Encyclopedia) hyperactivity, excessive physical activity of emotional or physiological origin, usually seen in young children; one of the components of attention deficit hyperactivity disorder . ...

hyperbola

(Encyclopedia) hyperbola hīpûr´bələ [key], plane curve consisting of all points such that the difference between the distances from any point on the curve to two fixed points (foci) is the same for all ...

hyperbole

(Encyclopedia) hyperbole hīpûr´bəlē [key], a figure of speech in which exceptional exaggeration is deliberately used for emphasis rather than deception. Andrew Marvell employed hyperbole throughout ...

Hyperboreans

(Encyclopedia) Hyperboreans hī˝pərbôr´ēənz, –bôrē´ənz [key], in Greek mythology, people dwelling in a state of perfect bliss in the Far North who were Apollo worshipers. ...

hyperinsulinism

(Encyclopedia) hyperinsulinism, presence in the system of an above-normal amount of insulin , the substance secreted by the pancreas and needed by the body to utilize sugar. An increased amount o...

Hyperion

(Encyclopedia) Hyperion hīpēr´ēən [key], in astronomy, one of the named moons, or natural satellites, of Saturn . Also known as Saturn VII (or S7), Hyperion is the largest highly irregular (nonsph...

Hyperion

(Encyclopedia) Hyperion, in Greek religion and mythology, a Titan. He was the husband of his sister Theia and the father by her of Helios, Selene, and Eos. It is sometimes said that he was the original sun go...