Alabama period () A period in the American eocene, the lowest in the tertiary age except the lignitic. |
Catskill period () The closing subdivision of the Devonian age in America. The rocks of this period are well developed in the Catskill mountains, and extend south and west under the Carboniferous formation. See the Diagram under Geology. |
Champlain period () A subdivision of the Quaternary age immediately following the Glacial period |
Chemung period () A subdivision in the upper part of the Devonian system in America, so named from the Chemung River, along which the rocks are well developed. It includes the Portage and Chemung groups or epochs. See the Diagram under Geology. |
Hamilton period () A subdivision of the Devonian system of America |
Niagara period () A subdivision or the American Upper Silurian system, embracing the Medina, Clinton, and Niagara epoch. The rocks of the Niagara epoch, mostly limestones, are extensively distributed, and at Niagara Falls consist of about eighty feet of shale supporting a greater thickness of limestone, which is gradually undermined by the removal of the shale. See Chart of Geology. |
Period (n.) A portion of time as limited and determined by some recurring phenomenon, as by the completion of a revolution of one of the heavenly bodies |
Period (n.) A stated and recurring interval of time |
Period (n.) One of the great divisions of geological time |
Period (n.) The termination or completion of a revolution, cycle, series of events, single event, or act |
Period (n.) A complete sentence, from one full stop to another |
Period (n.) The punctuation point [.] that marks the end of a complete sentence, or of an abbreviated word. |
Period (n.) One of several similar sets of figures or terms usually marked by points or commas placed at regular intervals, as in numeration, in the extraction of roots, and in circulating decimals. |
Period (n.) The time of the exacerbation and remission of a disease, or of the paroxysm and intermission. |
Period (n.) A complete musical sentence. |
Period (v. t.) To put an end to. |
Period (v. i.) To come to a period |
Salina period () The period in which the American Upper Silurian system, containing the brine-producing rocks of central New York, was formed. See the Chart of Geology. |
Trenton period () A subdivision in the lower Silurian system of America |
Wave (v. t.) See Waive. |
Wave (v. i.) To play loosely |
Wave (v. i.) To be moved to and fro as a signal. |
Wave (v. i.) To fluctuate |
Wave (v. t.) To move one way and the other |
Wave (v. t.) To raise into inequalities of surface |
Wave (v. t.) To move like a wave, or by floating |
Wave (v. t.) To call attention to, or give a direction or command to, by a waving motion, as of the hand |
Wave (v. i.) An advancing ridge or swell on the surface of a liquid, as of the sea, resulting from the oscillatory motion of the particles composing it when disturbed by any force their position of rest |
Wave (v. i.) A vibration propagated from particle to particle through a body or elastic medium, as in the transmission of sound |
Wave (v. i.) Water |
Wave (v. i.) Unevenness |
Wave (v. i.) A waving or undulating motion |
Wave (v. i.) The undulating line or streak of luster on cloth watered, or calendered, or on damask steel. |
Wave (v. i.) Fig.: A swelling or excitement of thought, feeling, or energy |
Wave (n.) Woe. |
overshoot wave-off go-around | an approach that fails and gives way to another attempt |
wave | a movement like that of a sudden occurrence or increase in a specified phenomenon, a wave of settlers, troops advancing in waves |
course session class period recitation | a regularly scheduled session as part of a course of study |
full-wave rectifier | rectifier that converts the negative half wave of an alternating current into a positive half wave |
period piece | any work of art whose special value lies in its evocation of a historical period |
waveguide wave guide | a hollow metal conductor that provides a path to guide microwaves, used in radar |
duality wave-particle duality | (physics) the property of matter and electromagnetic radiation that is characterized by the fact that some properties can be explained best by wave theory and others by particle theory |
wave | a hairdo that creates undulations in the hair |
finger wave | a wave made with the fingers |
permanent wave permanent perm | a series of waves in the hair made by applying heat and chemicals |
wave theory undulatory theory wave theory of light | (physics) the theory that light is transmitted as waves |
wave mechanics | the modern form of quantum theory, an extension of quantum mechanics based on Schrodinger's equation, atomic events are explained as interactions between particle waves |
Schrodinger equation Schrodinger wave equation | the fundamental equation of wave mechanics |
wave equation | a differential equation that describes the passage of harmonic waves through a medium |
period point full stop stop full point | a punctuation mark (.) placed at the end of a declarative sentence to indicate a full stop or after abbreviations, in England they call a period a stop |
wave waving wafture | the act of signaling by a movement of the hand |
crime wave | a sudden rise in the crime rate |
gravity wave gravitation wave | (physics) a wave that is hypothesized to propagate gravity and to travel at the speed of light |
sine wave | a wave whose waveform resembles a sine curve |
wave undulation | (physics) a movement up and down or back and forth |
soliton soliton wave solitary wave | (physics) a quantum of energy or quasiparticle that can be propagated as a traveling wave in nonlinear systems and is neither preceded nor followed by another such disturbance, does not obey the superposition principle and does not dissipate, soliton waves can travel long distances with little loss of energy or structure |
standing wave stationary wave | a wave (as a sound wave in a chamber or an electromagnetic wave in a transmission line) in which the ratio of its instantaneous amplitude at one point to that at any other point does not vary with time |
traveling wave travelling wave | a wave in which the medium moves in the direction of propagation of the wave |
sound wave acoustic wave | (acoustics) a wave that transmits sound |
air wave | a sound wave that is transmitted via air |
wave form waveform wave shape | the shape of a wave illustrated graphically by plotting the values of the period quantity against time |
shock wave blast wave | a region of high pressure travelling through a gas at a high velocity, the explosion created a shock wave |
swell crestless wave | the undulating movement of the surface of the open sea |
tidal wave | a wave resulting from the periodic flow of the tides that is caused by the gravitational attraction of the moon and sun |
tidal wave | an unusual (and often destructive) rise of water along the seashore caused by a storm or a combination of wind and high tide |
tidal wave | an overwhelming manifestation of some emotion or phenomenon, a tidal wave of nausea, the flood of letters hit him with the force of a tidal wave, a tidal wave of crime |
roller roll rolling wave | a long heavy sea wave as it advances towards the shore |
wave moving ridge | one of a series of ridges that moves across the surface of a liquid (especially across a large body of water) |
wave | something that rises rapidly, a wave of emotion swept over him, there was a sudden wave of buying before the market closed, a wave of conservatism in the country led by the hard right |
wave train | a succession of waves spaced at regular intervals |
avant-garde vanguard van new wave | any creative group active in the innovation and application of new concepts and techniques in a given field (especially in the arts) |
New Wave Nouvelle Vague | an art movement in French cinema in the s |
wave front wavefront | (physics) an imaginary surface joining all points in space that are reached at the same instant by a wave propagating through a medium |
Wave | a member of the women's reserve of the United States Navy, originally organized during World War II but now no longer a separate branch |
alpha rhythm alpha wave | the normal brainwave in the electroencephalogram of a person who is awake but relaxed, occurs with a frequency of - hertz |
beta rhythm beta wave | the normal brainwave in the encephalogram of a person who is awake and alert, occurs with a frequency between andhertz |
brainwave brain wave cortical potential | (neurophysiology) rapid fluctuations of voltage between parts of the cerebral cortex that are detectable with an electroencephalograph |
cold wave | a wave of unusually cold weather |
delta rhythm delta wave | the normal brainwave in the encephalogram of a person in deep dreamless sleep, occurs with high voltage and low frequency ( to hertz) |
electromagnetic radiation electromagnetic wave nonparticulate radiation | radiation consisting of waves of energy associated with electric and magnetic fields resulting from the acceleration of an electric charge |
Hertzian wave | an electromagnetic wave generated by oscillations in an electric circuit |
heat wave | a wave of unusually hot weather |
radio wave radio emission radio radiation | an electromagnetic wave with a wavelength between . cm to , m |
sky wave | a radio wave that is reflected back to earth by the ionosphere or a communications satellite, permits transmission around the curve of the earth's surface |
ionospheric wave | a sky wave that is reflected by the ionosphere |