Definition of solid noun from the Oxford Advanced Learner's Dictionary

      

    solid

     noun
    noun
    BrE BrE//ˈsɒlɪd//
     
    ; NAmE NAmE//ˈsɑːlɪd//
     
    Molecules and matter
     
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    not liquid/gas
  1. 1  a 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). Is calcium carbonate normally a solid or a liquid? See related entries: Molecules and matter
  2. shape
  3. 2 (geometry) a shape which has length, width and height, such as a cube
  4. Word Origin late Middle English: from Latin solidus; related to salvus ‘safe’ and sollus ‘entire’.
See the Oxford Advanced American Dictionary entry: solid