and-fro motion
71Gyro monorail — The gyro monorail, gyroscopic monorail, gyro stabilized monorail, or gyrocar all denote a single rail land vehicle, road or rail, which uses the gyroscopic action of a spinning wheel, which is forced to precess, to overcome the inherent inverted… …
72Lamb waves — propagate in solid plates. They are elastic waves whose particle motion lies in the plane defined by the plate normal and the direction of wave propagation. In 1917, the English mathematician Horace Lamb published his classic analysis and… …
73wave — I. verb (waved; waving) Etymology: Middle English, from Old English wafian to wave with the hands; akin to Old English wæfan to clothe and perhaps to Old English wefan to weave Date: before 12th century intransitive verb 1. to motion with the… …
74India — /in dee euh/, n. 1. Hindi, Bharat. a republic in S Asia: a union comprising 25 states and 7 union territories; formerly a British colony; gained independence Aug. 15, 1947; became a republic within the Commonwealth of Nations Jan. 26, 1950.… …
75History of the Caribbean — The history of the Caribbean reveals the significant role the region played in the colonial struggles of the European powers since the fifteenth century. In the twentieth century the Caribbean was again important during World War II, in the… …
76movement perception — ▪ process Introduction process through which humans and other animals orient themselves to their own or others physical movements. Most animals, including humans, move in search of food that itself often moves; they move to avoid predators… …
77wave — ► VERB 1) move one s hand to and fro in greeting or as a signal. 2) move (one s hand or arm, or something held in one s hand) to and fro. 3) move to and fro with a swaying motion while remaining fixed to one point. 4) style (hair) so that it… …
78vi|brate — «VY brayt», verb, brat|ed, brat|ing. –v.i. 1. a) to move rapidly to and fro: »A snake s tongue vibrates when he sticks it out. A piano string vibrates and makes a sound when a key is struck. SYNONYM(S): quiver, shake, tremble, throb …
79astronomy — /euh stron euh mee/, n. the science that deals with the material universe beyond the earth s atmosphere. [1175 1225; ME astronomie ( < AF) < L astronomia < Gk. See ASTRO , NOMY] * * * I Science dealing with the origin, evolution, composition,… …
80moon — mooner, n. moonless, adj. /moohn/, n. 1. the earth s natural satellite, orbiting the earth at a mean distance of 238,857 miles (384,393 km) and having a diameter of 2160 miles (3476 km). 2. this body during a particular lunar month, or during a… …
