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coherence
coherence constant phase difference in two or more Waves over time. Two waves are said to be in phase if their crests and troughs meet at the same place at the same time, and the waves are out of phase if the crests of one meet the troughs of another. The waves are incoherent if the crests and tr...
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stoat
stoat , European name for the short-tailed weasel , Mustela erminea, also called ermine when in its white winter phase.
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chromatography
chromatography , resolution of a chemical mixture into its component compounds by passing it through a system that retards each compound to a varying degree; a system capable of accomplishing this is called a chromatograph. The retarding system can be a surface adsorbant, such as silica, alumina, ce...
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cytology
cytology , in biology, the study of the structure of all normal and abnormal components of cells and the changes, movements, and transformations of such components. The discipline includes cytogenics, cytochemistry, and microscopic anatomy, which involve investigations employing various microscopes,...
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Docetism
Docetism [Gr.,=to appear], early heretical trend in Christian thought. Docetists claimed that Christ was a mere phantasm who only seemed to live and suffer. A similar tendency to deny Jesus' humanity appeared in the teachings of Simon Magus, Marcion, Gnosticism, and certain phases of monarchianism....
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gametophyte
gametophyte , phase of plant life cycles in which the gametes, i.e., egg and sperm, are produced. The gametophyte is haploid, that is, each cell contains a single complete set of chromosomes, and arises from the germination of a haploid spore. In many lower plants, the gametophyte phase is the domin...
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Decorated style
Decorated style name applied to the second period of English Gothic architecture from the late 13th to the mid-14th cent. The basic structural elements developed during the Early English style (late 12th and 13th cent.) were retained, but their decoration became more elaborate. Stone construction b...
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phase
phase in astronomy, the measure of how much of the illuminated surface of a planet or satellite can be seen from a point at a distance from that body; the term is most often used to describe the moon as seen from the earth. When the moon is between the earth and the sun, we cannot see the lighted h...
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surface chemistry
surface chemistry study of chemical reactions in which the reactants are first adsorbed onto a surface medium (see adsorption ) that then acts as a catalyst for the reaction; after the reaction the products are desorbed and the surface is left unchanged. Since the entire reaction takes place on ...
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ermine
ermine name for a number of northern species of weasel having white coats in winter, and highly prized for their white fur. It most commonly refers to the white phase of Mustela erminea, called short-tailed weasel in North America and stoat in the Old World. The white pelts are made into wraps,...
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