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herbicide
(Encyclopedia) herbicideherbicidehrˈbəsīdˌ [key], chemical compound that kills plants or inhibits their normal growth. A herbicide in a particular formulation and application can be described as…iridescence
(Encyclopedia) iridescenceiridescenceĭrˌədĕsˈəns [key], exhibition of rainbowlike colors on a surface. It usually results from interference when light composed of different wavelengths is reflected…lake, in dyeing
(Encyclopedia) lake, in dyeing, an insoluble pigment formed by the reaction between an organic dye and a mordant. The color of a lake depends upon the mordant as well as the dye used. Generally,…chloroprene
(Encyclopedia) chloroprenechloropreneklōrˈəprēnˌ [key] or 2-chloro-1,3-butadiene, colorless liquid organic compound used in the synthesis of neoprene and certain other rubbers. The structure of the…coal tar
(Encyclopedia) coal tar, product of the destructive distillation of bituminous coal. Coal tar can be distilled into many fractions to yield a number of useful organic products, including benzene,…Gnathustomulida
(Encyclopedia) GnathustomulidaGnathustomulidanāˌthyəstəmy&oomacr;ˈlĭdə [key], phylum of microscopic worms described in 1956 that have elongated bodies, cilia, and are hermaphroditic. The 80 known…Butlerov, Aleksandr Mikhailovich
(Encyclopedia) Butlerov, Aleksandr MikhailovichButlerov, Aleksandr Mikhailovichəlyĭksänˈdər mēkhīlˈəvĭch b&oomacr;tˈlyərôf [key], 1825–86, Russian chemist. As professor at the Univ. of Kazan he…Baumeister, Willi
(Encyclopedia) Baumeister, WilliBaumeister, Willivĭlˈē bouˈmīstər [key], 1889–1955, German artist. Influenced by primitive art and Miro's surrealism, Baumeister created abstractions that contain…Concordat of 1801
(Encyclopedia) Concordat of 1801, agreement between Napoleon Bonaparte and Pope Pius VII that reestablished the Roman Catholic Church in France. Napoleon took the initiative in negotiating this…sediment
(Encyclopedia) sediment, mineral or organic particles that are deposited by the action of wind, water, or glacial ice. These sediments can eventually form sedimentary rocks (see rock). Sediments…Trending
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