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complementarity principle
(Encyclopedia) complementarity principle, physical principle enunciated by Niels Bohr in 1928 stating that certain physical concepts are complementary. If two concepts are complementary, an…timothy , in botany
(Encyclopedia) timothy or herd's-grass, perennial plant (Phleum pratense) of the family Poaceae (grass family), native to Europe and W Asia and one of the most widely cultivated hay grass of North…lightship
(Encyclopedia) lightship, moored vessel bearing lights and other signal devices to guide ships and warn of hazards to navigation. Lightships are generally stationed at points where a lighthouse…uncertainty principle
(Encyclopedia) uncertainty principle, physical principle, enunciated by Werner Heisenberg in 1927, that places an absolute, theoretical limit on the combined accuracy of certain pairs of simultaneous…layering
(Encyclopedia) layering, horticultural practice of propagating a plant by rooting a branch before severing it from the mother plant. Typically the branch is bent and a section that has been slit or…circumpolar star
(Encyclopedia) circumpolar star, star whose diurnal circle lies completely above or completely below an observer's horizon. A star whose diurnal circle lies above the horizon never sets, even though…Sitter, Willem de
(Encyclopedia) Sitter, Willem deSitter, Willem devĭlˈəm də sĭtˈər [key], 1872–1934, Dutch astronomer and mathematician. He was professor from 1908 at the Univ. of Leiden and in 1919 became director…conjunction, in astronomy
(Encyclopedia) conjunction, in astronomy, alignment of two celestial bodies as seen from the earth. Conjunction of the moon and the planets is often determined by reference to the sun. When a body is…commensalism
(Encyclopedia) commensalismcommensalismkəmĕnˈsəlĭzˌəm [key], relationship between members of two different species of organisms in which one individual is usually only slightly benefited, while the…gramicidin
(Encyclopedia) gramicidingramicidingrămˌĭsīdˈən [key], antibiotic obtained from the bacterial species Bacillus brevis, which is found in soil. Gramicidin is particularly effective against gram-…Trending
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