Make+circular
121percussion instrument — a musical instrument, as the drum, cymbal, triangle, xylophone, or piano, that is struck to produce a sound, as distinguished from string or wind instruments. [1870 75] * * * A musical instrument that is struck (or sometimes shaken or scraped) to …
122sound — sound1 soundable, adj. /sownd/, n. 1. the sensation produced by stimulation of the organs of hearing by vibrations transmitted through the air or other medium. 2. mechanical vibrations transmitted through an elastic medium, traveling in air at a… …
123economic stabilizer — Any of the institutions and practices in an economy that serve to reduce fluctuations in the business cycle through offsetting effects on the amounts of income available for spending (disposable income). The progressive income tax, unemployment… …
124Piaget's theory of cognitive development — For more information, see Neo Piagetian theories of cognitive development. Piaget s theory of cognitive development is a comprehensive theory about the nature and development of human intelligence first developed by Jean Piaget. It is primarily… …
125Orbital perturbation analysis (spacecraft) — Isaac Newton in his Philosophiæ Naturalis Principia Mathematica demonstrated that the gravitational force between two mass points is inversely proportional to the square of the distance between the points and fully solved corresponding two body… …
126ring — 1. n. & v. n. 1 a circular band, usu. of precious metal, worn on a finger as an ornament or a token of marriage or betrothal. 2 a circular band of any material. 3 the rim of a cylindrical or circular object, or a line or band round it. 4 a mark… …
127Fountain — For other uses, see Fountain (disambiguation). the Jet d eau, in Geneva (1951), rises 140 meters (459 feet) above Lake Geneva …
128Airy disk — Computer generated image of an Airy disk. The gray scale intensities have been adjusted to enhance the brightness of the outer rings of the Airy pattern …
