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 van der Waals van der Waals /væn dər wɔːlz/

noun

  1. Dutch physicist (1837-1923)  ( Johannes Diderik van der Waals , Johannes van der Waals , van der Waals )
    Dutch physicist (1837-1923)


 breeder reactor breeder reactor /ˈbriːdər riːˈæktər/

noun

  1. A nuclear reactor that produces more fissile material than it burns  ( breeder reactor )
    a nuclear reactor that produces more fissile material than it burns
     The advantage of the breeder reactor is its ability to produce more fissile material than it consumes.
    The advantage of the breeder reactor is its ability to produce more fissile material than it consumes.


 springtail springtail /ˈsprɪŋˌteɪl/

noun

  1. Any of numerous minute wingless primitive insects possessing a special abdominal appendage that allows the characteristic nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water  ( collembolan , springtail )
    any of numerous minute wingless primitive insects possessing a special abdominal appendage that allows the characteristic nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water


 achondrite achondrite /əˈkɒndraɪt/

noun

  1. A stony meteor lacking chondrules  ( achondrite )
    a stony meteor lacking chondrules
     The scientist showed us an achondrite, explaining its meteoric origins and lack of chondrules.
    The scientist showed us an achondrite, explaining its meteoric origins and lack of chondrules.