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horseshoe crab

(Encyclopedia)horseshoe crab, large, primitive marine arthropod of the family Limulidae, related to the spider and scorpion and sometimes called a king crab (a name also used for the largest of the edible true crab...

Ordovician period

(Encyclopedia)Ordovician period ôrdəvĭshˈən [key] [from the Ordovices, ancient tribe of N Wales], second period of the Paleozoic era of geologic time (see Geologic Timescale, tablegeologic timescale, table) fr...

continental drift

(Encyclopedia)CE5 Continental drift (arrows indicate the directions of motion of the landmasses) A. Proposed reconstruction of the supercontinent Pangaea indicating the major present landmasses B. Proposed recon...

ornament, in music

(Encyclopedia)ornament, in music, notes added to a melodic line for the purpose of embellishment or decoration, often called graces. Ornamentation was practiced as early as the Middle Ages by the singers of plainso...

New Education Fellowship

(Encyclopedia)New Education Fellowship, an international organization dedicated to the ideals of progressive education. It was established in 1921 by Beatrice Ensor, founder of a progressive school in Letchworth, E...

Karroo

(Encyclopedia)Karroo or Karoo both: kəro͞oˈ, kä– [key], the semiarid plateaus of South Africa. The Little Karroo, in Western Cape, is located N of the Langeberg and Outeniqua Ranges and extends c.200 mi (320 ...

Dionysius Exiguus

(Encyclopedia)Dionysius Exiguus dīənĭshˈēəs ĕksĭgˈyo͞oəs [key], d. c.545, Roman monk, chronologist, and scholar, a transmitter of Greek thought to the Middle Ages. He made collections of 5th-century papa...

Olympiad

(Encyclopedia)Olympiad, unit of a chronological era of ancient Greece, a four-year period, each one beginning with the Olympic games. Timaeus (c.356–c.260 b.c.) of Sicily was the first to use, as a check on chron...

Sunday, Billy

(Encyclopedia)Sunday, Billy (William Ashley Sunday), 1863–1935, American evangelist, b. Ames, Iowa, in the era around World War I. A professional baseball player (1883–90), he later worked for the Young Men's C...

Isesaki

(Encyclopedia)Isesaki ēsāˈsäkē [key], city, Gumma prefecture, central Honshu, Japan. The city's main i...