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sexually transmitted disease

(Encyclopedia)sexually transmitted disease (STD) or venereal disease, term for infections acquired mainly through sexual contact. Five diseases were traditionally known as venereal diseases: gonorrhea, syphilis, an...

gravitation

(Encyclopedia)gravitation, the attractive force existing between any two particles of matter. The term gravitygravity is commonly used synonymously with gravitation, but in correct usage a definite distinction is...

mechanics

(Encyclopedia)mechanics, branch of physics concerned with motion and the forces that tend to cause it; it includes study of the mechanical properties of matter, such as density, elasticity, and viscosity. Mechanics...

magic, in entertainment

(Encyclopedia)magic, in entertainment, the seeming manipulation and supernatural control of the natural world for the amusement and amazement of an audience. Entertainment magic can be divided into four main catego...

Saint Petersburg, city, Russia

(Encyclopedia)Saint Petersburg, formerly Leningrad, Rus. Sankt-Peterburg, city (1990 est. pop. 5,036,000), capital of the Leningrad region (although not administratively part of it) and the administrative center of...

fern

(Encyclopedia)CE5 Life cycle of a fern fern, any plant of the division Polypodiophyta. Fern species, numbering several thousand, are found throughout the world but are especially abundant in tropical rain fores...

Icelandic literature

(Encyclopedia)Icelandic literature, the literature of Iceland. For the earliest literature of Iceland, see Old Norse literature. The 20th cent. saw the rise of a more introspective writing, influenced by Nietzsch...

golf

(Encyclopedia)golf, game of hitting a small hard ball with specially made clubs over an outdoor course sometimes (particularly if it is near the coast) called a links. The object is to deposit the ball in a specifi...

Pluto, in astronomy

(Encyclopedia)Pluto, in astronomy, a dwarf planet and the first Kuiper belt, or transneptunian, object (see comet) to be discovered (1930) by astronomers. Pluto has an elliptical orbit usually lying beyond that of ...

Sparta

(Encyclopedia)Sparta spärˈtə [key], city of ancient Greece, capital of Laconia, on the Eurotas (Evrótas) River in the Peloponnesus. By the 6th cent. b.c., Sparta was the strongest Greek city. In the Persian ...