Definition of solid noun from the Oxford Advanced American Dictionary

     

    solid

     noun
    noun
    NAmE//ˈsɑləd//
     
     
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    not liquid/gas
  1. 1a substance or an object that is solid, not a liquid or a gas liquids and solids The baby is not yet on solids (= eating solid food).
  2. shape
  3. 2(geometry) a shape that has length, width, and height, such as a cube
See the Oxford Advanced Learner's Dictionary entry: solid