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Harpestreng, Henrik

(Encyclopedia)Harpestreng, Henrik, or Henricus Dacus, d. 1244, Danish herbalist and medical writer. He probably studied at the medical school in Salerno, and was a canon at Roskilde Cathedral, then Denmark's eccles...

Arany, János

(Encyclopedia)Arany, János yäˈnôsh ŏˈrŏnyə [key], 1817–82, Hungarian poet. Arany is considered one of the founders of modern Hungarian poetry. He was an actor, notary, editor, and professor of Hungarian l...

hat

(Encyclopedia)hat, headdress developed from the simple close-fitting cap and hood of antiquity. The first hat, which was distinguished as such by having a brim, was the felt petasus of the Greeks, which tied under ...

conjoined twins

(Encyclopedia)conjoined twins, congenitally united organisms that are complete or nearly complete individuals, historically known as Siamese twins. They develop from a single fertilized ovum that has divided imperf...

Close, Chuck

(Encyclopedia)Close, Chuck (Charles Thomas Close), 1940–2021, American painter, b. Monroe, Wash., Univ. of Washington (B.A., 1962), Yale Univ. (B.F.A., 1963; M.F.A...

paralysis

(Encyclopedia)paralysis or palsy pôlˈzē [key], complete loss or impairment of the ability to use voluntary muscles, usually as the result of a disorder of the nervous system. The nervous tissue that is injured m...

hydroponics

(Encyclopedia)hydroponics, growing of plants without soil in water to which nutrients have been added. Hydroponics has been used for over a century as a research technique, but not until 1929 were experiments condu...

harmonic

(Encyclopedia)harmonic. 1 Physical term describing the vibration in segments of a sound-producing body (see sound). A string vibrates simultaneously in its whole length and in segments of halves, thirds, fourths, e...

calculus of variations

(Encyclopedia)calculus of variations, branch of mathematics concerned with finding maximum or minimum conditions for a relationship between two or more variables that depends not only on the variables themselves, a...

Irnerius

(Encyclopedia)Irnerius ûrˌnērˈēəs [key], c.1055–c.1130, Italian jurist and founder of the law school (c.1088) at Bologna, which became the center of legal scholarship in Europe. Though little is known of hi...