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alternation of generations |
Noun
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the alternation of two or more different forms in the life cycle of a plant or animal |
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alternative energy |
Noun
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energy derived from sources that do not use up natural resources or harm the environment |
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amperage |
Noun
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the strength of an electrical current measured in amperes |
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annual ring |
Noun
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an annual formation of wood in plants as they grow |
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antitrades |
Noun
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wind in the upper atmosphere blowing above but in the opposite direction from the trade winds |
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apparent motion |
Noun
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an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object |
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apparent movement |
Noun
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an optical illusion of motion produced by viewing a rapid succession of still pictures of a moving object |
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acoustic phenomenon |
Noun
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a physical phenomenon associated with the production or transmission of sound |
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atmospheric phenomenon |
Noun
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a physical phenomenon associated with the atmosphere |
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atomic energy |
Noun
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the energy released by a nuclear reaction |
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atomic power |
Noun
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nuclear energy regarded as a source of electricity for the civilian power grid |
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atomic spectrum |
Noun
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(physics) a spectrum of radiation caused by electron transitions within an atom |
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attractive force |
Noun
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the force by which one object attracts another |
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aurora |
Noun
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an atmospheric phenomenon consisting of bands of light caused by charged solar particles following the earth's magnetic lines of force |
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aurora |
Noun
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the first light of day |
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aurora australis |
Noun
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the aurora of the southern hemisphere |
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aurora borealis |
Noun
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the aurora of the northern hemisphere |
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autofluorescence |
Noun
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self-induced fluorescence |
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angular acceleration |
Noun
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(physics) the rate of change of the angular velocity of a rotating body |
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angular velocity |
Noun
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(physics) the rate of change of the angular position of a rotating body |
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apoptosis |
Noun
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a type of cell death in which the cell uses specialized cellular machinery to kill itself |
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aerobiosis |
Noun
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life sustained in the presence of air or oxygen |
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atmospheric electricity |
Noun
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electrical discharges in the atmosphere |
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antiferromagnetism |
Noun
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magnetic field creates parallel but opposing spins |
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ascocarp |
Noun
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mature fruiting body of an ascomycetous fungus |
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acervulus |
Noun
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small asexual fruiting body resembling a cushion or blister consisting of a mat of hyphae that is produced on a host by some fungi |
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antitrade wind |
Noun
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winds blowing from west to east and lying above the trade winds in the tropics |
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ascoma |
Noun
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an ascocarp having the spore-bearing layer of cells (the hymenium) on a broad disklike receptacle |
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antitrade |
Noun
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winds blowing from west to east and lying above the trade winds in the tropics |
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apothecium |
Noun
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a cuplike ascocarp in many lichens and ascomycetous fungi |
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acrogen |
Noun
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any flowerless plant such as a fern (pteridophyte) or moss (bryophyte) in which growth occurs only at the tip of the main stem |
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apomict |
Noun
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a plant that reproduces or is reproduced by apomixis |
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acoustic spectrum |
Noun
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the distribution of energy as a function of frequency for a particular sound source |
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arc |
Noun
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electrical conduction through a gas in an applied electric field |
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arc |
Noun
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a continuous portion of a circle |
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arc |
Noun
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something curved in shape |
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arc |
Verb
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to an arch or curve |
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amplitude distortion |
Noun
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distortion that occurs when the output signal does not have a linear relation to the input signal |
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acoustic projection |
Noun
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the acoustic phenomenon that gives sound a penetrating quality |
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acrocarp |
Noun
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a moss in which the main axis is terminated by the archegonium (and hence the capsule) |
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acrocarpous moss |
Noun
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a moss in which the main axis is terminated by the archegonium (and hence the capsule) |
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atmospheric condition |
Noun
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the atmospheric conditions that comprise the state of the atmosphere in terms of temperature and wind and clouds and precipitation |
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air current |
Noun
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air moving (sometimes with considerable force) from an area of high pressure to an area of low pressure |
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acoustic resistance |
Noun
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opposition to the flow of sound through a surface |
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acoustic impedance |
Noun
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opposition to the flow of sound through a surface |
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acoustic reactance |
Noun
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opposition to the flow of sound through a surface |
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annual parallax |
Noun
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the parallax of a celestial body using two points in the earth's orbit around the sun as the baseline |
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asterid dicot family |
Noun
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family of more or less advanced dicotyledonous herbs and some trees and shrubs |
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arolla pine |
Noun
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large five-needled European pine |
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asterid dicot genus |
Noun
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genus of more or less advanced dicotyledonous herbs and some trees and shrubs |