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sun dance

(Encyclopedia)sun dance, ceremony typical of the Plains Indians of North America. The ceremony was performed in the summer and lasted from two to eight days. Some of the ceremony was secret. Smoking, fasting, and o...

Waubeshiek

(Encyclopedia)Waubeshiek wôˈbəshēk [key], c.1794–c.1841, Native North American prophet, also known as White Cloud. He was a friend and adviser of Black Hawk and by prophesying victory was chiefly responsible ...

canker

(Encyclopedia)canker, small sore on the inside of the mouth. A canker appears as a shallow, whitish ulcer surrounded by a thin, red area. It is tender, sometimes painful, and may occur singly or as one of a group o...

Rathenau, Walther

(Encyclopedia)Rathenau, Walther välˈtər räˈtənou [key], 1867–1922, German industrialist, social theorist, and statesman. Son of Emil Rathenau (1838–1915), founder of the German public utilities company Al...

oilbird

(Encyclopedia)oilbird, common name for an owllike, cave-dwelling bird, Steatornis caripensis, belonging to the family Steatornithidae. It spends its days in dark caves, maneuvering by means of a batlike sonar devic...

infant respiratory distress syndrome

(Encyclopedia)infant respiratory distress syndrome (IRDS) or hyaline membrane disease hīˈəlĭn, –līnˌ [key], respiratory distress syndrome of newborns, most common in infants born prematurely or by cesarean ...

einsteinium

(Encyclopedia)einsteinium īnˈstīˌnēəm, īnstīˈ– [key] [for Albert Einstein], artificially produced radioactive chemical element; symbol Es; at. no. 99; mass no. of most stable isotope 252; m.p. about 860�...

Pentecost

(Encyclopedia)Pentecost pĕnˈtəkôst [key] [Gr.,=fiftieth], important Jewish and Christian feast. The Jewish feast of Pentecost, in Hebrew Shavuot, the Feast of Weeks, one of the three pilgrimage festivals, arose...

Limann, Hilla

(Encyclopedia)Limann, Hilla hĭlˈə lēˈmän [key], 1934–98, president of Ghana (1979–81). In 1979, after seven years of military rule, Ghana's new military leader, Jerry Rawlings, handed over power to Limann...

mean

(Encyclopedia)mean, in statistics, a type of average. The arithmetic mean of a group of numbers is found by dividing their sum by the number of members in the group; e.g., the sum of the seven numbers 4, 5, 6, 9, 1...