Columbia Encyclopedia

(Encyclopedia) Grignard reagent grēnyärdˈ rēāˈjənt [key], any of an important class of extremely reactive chemical compounds used in the synthesis of hydrocarbons, alcohols, carboxylic acids, and other compou...

(Encyclopedia) World Trade Center, former building complex in lower Manhattan, New York City, consisting of seven buildings and a shopping concourse on a 16-acre (6.5-hectare) site; it was destroyed by a terrorist a...

(Encyclopedia)  CE5 Lines of induction around a single bar magnet and between opposite poles of different magnets magnetism, force of attraction or repulsion between various substances, especially those made of i...

(Encyclopedia) Luria or Loria, Isaac ben Solomon lo͝orˈēə, lôrˈ– [key], 1534–72, Jewish kabbalist, surnamed Ashkenazi, called Ari [lion] by his followers, b. Jerusalem. In his 20s he spent seven years in s...

(Encyclopedia) Nuer no͞oˈər, no͝or [key], a Nilotic people living around Lake No in South Sudan. Their economy and social life generally revolve around cattle, which are grazed on the plains during the dry seaso...

(Encyclopedia) apocalypse əpŏkˈəlĭps [key] [Gr.,=uncovering], genre represented in early Jewish and in Christian literature in which the secrets of the heavenly world or of the world to come are revealed by ang...

(Encyclopedia) neostigmine nēˌōstĭgˈmēn, –mĭn [key], drug used to mimic the effects of stimulation of the parasympathetic nervous system. Along with several other drugs that have a similar mode of action, i...

(Encyclopedia) autogiro jīˈrəplān [key], type of aircraft supported in the air by a horizontally mounted airfoil similar to that of a helicopter but unpowered. Invented by the Spaniard Juan de la Cierva, it was ...

(Encyclopedia) moraine mərānˈ [key], a formation composed of unsorted and unbedded rock and soil debris called till, which was deposited by a glacier. The till that falls on the sides of a valley glacier from the...

(Encyclopedia) Bill of Rights, 1689, in British history, one of the fundamental instruments of constitutional law. It registered in statutory form the outcome of the long 17th-century struggle between the Stuart kin...