"Roman ring" meaning in English

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      "form": "Roman rings",
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  "lang_code": "en",
  "pos": "noun",
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          "name": "English entries with incorrect language header",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Black holes",
          "orig": "en:Black holes",
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            "Astronomy",
            "Astrophysics",
            "Gravity",
            "Relativity",
            "Sciences",
            "Space",
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Faster-than-light travel",
          "orig": "en:Faster-than-light travel",
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            "Astrophysics",
            "Relativity",
            "Science fiction",
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            "Astronomy",
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          "langcode": "en",
          "name": "Relativity",
          "orig": "en:Relativity",
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            "Physics",
            "Sciences",
            "All topics",
            "Fundamental"
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        {
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          "langcode": "en",
          "name": "Time",
          "orig": "en:Time",
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            "Fundamental"
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Time travel",
          "orig": "en:Time travel",
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            "Science fiction",
            "Time",
            "Travel",
            "Physics",
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            "Human activity",
            "Transport",
            "Sciences",
            "Artistic works",
            "Genres",
            "Fundamental",
            "Human behaviour",
            "Art",
            "Entertainment",
            "Human",
            "Culture",
            "Society"
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        }
      ],
      "glosses": [
        "A configuration of wormholes where for each individual wormhole the time difference across its mouths is such that it may not allow a closed timelike curve."
      ],
      "id": "en-Roman_ring-en-noun-x6yqpG8l",
      "links": [
        [
          "wormhole",
          "wormhole"
        ],
        [
          "time",
          "time"
        ],
        [
          "mouth",
          "mouth"
        ],
        [
          "closed timelike curve",
          "closed timelike curve"
        ]
      ],
      "wikipedia": [
        "Roman ring"
      ]
    }
  ],
  "word": "Roman ring"
}

{
  "forms": [
    {
      "form": "Roman rings",
      "tags": [
        "plural"
      ]
    }
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      "expansion": "Roman ring (plural Roman rings)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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        "English entries with incorrect language header",
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        "en:Black holes",
        "en:Faster-than-light travel",
        "en:Relativity",
        "en:Time",
        "en:Time travel"
      ],
      "glosses": [
        "A configuration of wormholes where for each individual wormhole the time difference across its mouths is such that it may not allow a closed timelike curve."
      ],
      "links": [
        [
          "wormhole",
          "wormhole"
        ],
        [
          "time",
          "time"
        ],
        [
          "mouth",
          "mouth"
        ],
        [
          "closed timelike curve",
          "closed timelike curve"
        ]
      ],
      "wikipedia": [
        "Roman ring"
      ]
    }
  ],
  "word": "Roman ring"
}