"air-smoothed" meaning in English

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      "expansion": "air-smoothed",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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            "Entries with incorrect language header",
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      "examples": [
        {
          "ref": "1960 March, G. Freeman Allen, “Europe's most luxurious express - the \"Settebello\"”, in Trains Illustrated, page 141:",
          "text": "The exterior of the train is perfectly air-smoothed and to cut passenger steps up to recessed doors would never do; when the deep doors are shut, therefore, the steps fold up ingeniously on the inside of them to create a level floor in the corridor of the coach.",
          "type": "quote"
        }
      ],
      "glosses": [
        "streamlined"
      ],
      "id": "en-air-smoothed-en-adj-W~tJzBbV",
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        "(rare) streamlined"
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      "tags": [
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  "word": "air-smoothed"
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{
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      "expansion": "air-smoothed",
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
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    {
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        "English adjectives",
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        "English terms with quotations",
        "English terms with rare senses",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "examples": [
        {
          "ref": "1960 March, G. Freeman Allen, “Europe's most luxurious express - the \"Settebello\"”, in Trains Illustrated, page 141:",
          "text": "The exterior of the train is perfectly air-smoothed and to cut passenger steps up to recessed doors would never do; when the deep doors are shut, therefore, the steps fold up ingeniously on the inside of them to create a level floor in the corridor of the coach.",
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      ],
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        "streamlined"
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        "(rare) streamlined"
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      "tags": [
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  ],
  "word": "air-smoothed"
}