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dark energy

(Encyclopedia)dark energy, repulsive force that opposes the self-attraction of matter (see gravitation) and causes the expansion of the universe to accelerate. The search for dark energy was triggered by the discov...

oxycodone

(Encyclopedia) oxycodone is a synthetic opioid developed to treat pain. Oxycodone was originally developed in Germany in 1917 from a synthesis of thebaine, an alkaloi...

drum, in music

(Encyclopedia)CE5 Drums drum, in music, percussion instrument, known in various forms and played throughout the world and throughout history. Essentially a drum is a frame over which one or more membranes or sk...

Grünewald, Mathias

(Encyclopedia)Grünewald, Mathias mätēˈäs grünˈəvält [key], c.1475–1528, German painter of religious subjects. His original name was Mathis Gothart Neithart. Although he assimilated various compositional ...

Steichen, Edward

(Encyclopedia)Steichen, Edward stīˈkən [key], 1879–1973, American photographer, b. Luxembourg, reared in Hancock, Mich. Steichen is credited with the transformation of photography into an art form. At 16, whil...

sunburn

(Encyclopedia)sunburn, inflammation of the skin caused by actinic rays from the sun or artificial sources. Moderate exposure to ultraviolet radiation is followed by a red blush, but severe exposure may result in bl...

perspective

(Encyclopedia)perspective, in art, any method employed to represent three-dimensional space on a flat surface or in relief sculpture. Although many periods in art showed some progressive diminution of objects seen ...

acoustics

(Encyclopedia)acoustics əko͞oˈstĭks [key] [Gr.,=the facts about hearing], the science of sound, including its production, propagation, and effects. Various branches of acoustics that deal with different aspects...

Spanish art and architecture

(Encyclopedia)Spanish art and architecture, works of art and architecture produced in what is now the European country of Spain. Open to a wide variety of cultural influences, the art and architecture of Spain have...

cancer, in medicine

(Encyclopedia)cancer, in medicine, common term for neoplasms, or tumors, that are malignant. Like benign tumors, malignant tumors do not respond to body mechanisms that limit cell growth. Unlike benign tumors, mali...