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any of several composite plants of the genus Boltonia, of the U.S., having blue, purple, or white asterlike flower heads.
any North American plant of the genus Boltonia, having daisy-like flowers with white, violet, or pinkish rays: family Compositae (composites)


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  • Bolts

    a movable bar or rod that when slid into a socket fastens a door, gate, etc. the part of a lock that is shot from and drawn back into the case, as by the action of the key. any of several types of strong fastening rods, pins, or screws, usually threaded to receive a nut. […]

  • Boltzmann-constant

    the ratio of the universal gas constant to Avogadro’s number, equal to 1.3803 × 10 −16 erg per degree C. Symbol: k. noun (physics) the ratio of the gas constant to the Avogadro constant, equal to 1.380 650 × 10–23 joule per kelvin k

  • Boltzmann

    Ludwig [lood-vikh,, loot-] /ˈlud vɪx,, ˈlut-/ (Show IPA), 1844–1906, Austrian physicist. noun Ludwig (ˈluːtvɪç). 1844–1906, Austrian physicist. He established the principle of the equipartition of energy and developed the kinetic theory of gases with J. C. Maxwell Boltzmann (bôlts’män’) Austrian physicist who developed statistical mechanics, the branch of physics that explains how the properties of […]

  • Bolus

    Pharmacology, Veterinary Medicine. a round mass of medicinal material, larger than an ordinary pill. Abbreviation: bol. a soft, roundish mass or lump, especially of chewed food. bole2 . Contemporary Examples Drug-Resistant Gonorrhea, the ‘Sex Superbug,’ Is Not Worse Than AIDS Kent Sepkowitz May 6, 2013 Historical Examples The Origin of Vertebrates Walter Holbrook Gaskell The […]

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