a sheet of smooth, hard material, especially dark slate, used in schools, lecture rooms, etc., for writing or drawing on with chalk.
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a hard or rigid surface made of a smooth usually dark substance, used for writing or drawing on with chalk, esp in teaching
a school or school system characterized by lack of discipline and by juvenile delinquency.
a hypothetical body that absorbs without reflection all of the electromagnetic radiation incident on its surface. blackbody (blāk’bŏd’ē) A theoretically perfect absorber and emitter of every frequency of electromagnetic radiation. The radiation emitted by a blackbody is a function only of its temperature.
a hypothetical body that absorbs without reflection all of the electromagnetic radiation incident on its surface. Contemporary Examples Inside Philip Seymour Hoffman’s Apartment Michael Daly February 1, 2014 Historical Examples Moran of the Lady Letty Frank Norris Fantazius Mallare Ben Hecht Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 Various Life On The Mississippi, Complete […]
a book of names of people liable to censure or punishment. in someone’s black books, in disfavor with someone. noun a book containing the names of people to be punished, blacklisted, etc (informal) in someone’s black books, out of favour with someone A list of persons or things out of favor, as in Tom’s in […]