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mass, in physics

(Encyclopedia)mass, in physics, the quantity of matter in a body regardless of its volume or of any forces acting on it. The term should not be confused with weight, which is the measure of the force of gravity (se...

lens, in optics

(Encyclopedia)CE5 Lenses lens, device for forming an image of an object by the refraction of light. In its simplest form it is a disk of transparent substance, commonly glass, with its two surfaces curved or wi...

medusa, in zoology

(Encyclopedia)medusa, in zoology, scientific name for the jellyfish, i.e., the free-swimming stage of various animals in the phylum Cnidaria. See polyp and medusa. ...

abacus, in mathematics

(Encyclopedia)CE5 Chinese abacus: Numbers are represented by moving beads to the central crossbar. abacus ăbˈəkəs, əbăkˈ– [key], in mathematics, simple device for performing arithmetic calculations. Th...

style, in literature

(Encyclopedia)style, in literature, the mysterious yet recognizable result of a successful blending of form with content. Generally speaking, all the arts reflect one of two stylistic tendencies: the classical or t...

rocket, in botany

(Encyclopedia)rocket, in botany, popular name for several plants of the family Cruciferae (or Brassicaceae; mustard family). The dame's, or damask, violet, damewort, or sweet rocket is Hesperis matronalis, a hardy,...

code, in communications

(Encyclopedia)code, in communications, set of symbols and rules for their manipulation by which the symbols can be made to carry information. By this extended definition all written and spoken languages are codes. ...

skeleton, in anatomy

(Encyclopedia)CE5 Human skeleton skeleton, in anatomy, the stiff supportive framework of the body. The two basic types of skeleton found among animals are the exoskeleton and the endoskeleton. The shell of the ...

America, in geography

(Encyclopedia)America [for Amerigo Vespucci], the lands of the Western Hemisphere—North America, Central (or Middle) America, and South America. The world map published in 1507 by Martin Waldseemüller is the fir...

realism, in literature

(Encyclopedia)realism, in literature, an approach that attempts to describe life without idealization or romantic subjectivity. Although realism is not limited to any one century or group of writers, it is most oft...