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harp

(Encyclopedia)CE5 Harp harp, stringed musical instrument of ancient origin, the strings of which are plucked with the fingers. Harps were found in paintings from the 13th cent. b.c. at Thebes. In different form...

harpsichord

(Encyclopedia)CE5 Harpsichord harpsichord, stringed musical instrument played from a keyboard. Its strings, two or more to a note, are plucked by quills or jacks. The harpsichord originated in the 14th cent. an...

grille

(Encyclopedia)CE5 Grille grille, in architecture, a system of bars, usually of decorative metalwork, forming an openwork barrier or enclosure. In its usual materials of wrought iron or bronze, it has been favor...

glycine

(Encyclopedia)CE5 glycine glīˈsēn [key], organic compound, one of the 20 amino acids commonly found in animal proteins. Glycine is the only one of these amino acids that is not optically active, i.e., it does...

Golden Section

(Encyclopedia)CE5 Rectangle ABCD is a golden rectangle. Removing the square AEFD leaves the rectangle EBCF Golden Section, in mathematics, division of a line segment into two segments such that the ratio of the...

arachnid

(Encyclopedia)CE5 Internal anatomy of a spider, representative of the class Arachnida arachnid ərăkˈnĭd [key], mainly terrestrial arthropod of the class Arachnida, including the spider, scorpion, mite, tick...

e, in mathematics

(Encyclopedia)e, in mathematics, irrational number occurring widely in mathematics and science, approximately equal to the value 2.71828; it is the base of natural, or Naperian, logarithms. The number e is defined ...

amaranth

(Encyclopedia)CE5 Green amaranth, Amaranthus retroflexus amaranth ămˈərănthˌ [key] [Gr.,=unfading], common name for the Amaranthaceae (also commonly known as the pigweed family), a family of herbs, trees, ...

basilica

(Encyclopedia)CE5 Floor plan of a basilica basilica bəsĭlˈĭkə [key], large building erected by the Romans for transacting business and disposing of legal matters. Rectangular in form with a roofed hall, th...

perception

(Encyclopedia)perception, in psychology, mental organization and interpretation of sensory information. The Gestalt psychologists studied extensively the ways in which people organize and select from the vast array...