"restframe" meaning in English

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      "expansion": "rest + frame",
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  "etymology_text": "From rest + frame.",
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      "glosses": [
        "The Lorentz frame in which the total momentum of a system is zero"
      ],
      "id": "en-restframe-en-noun-CYOyq0sC",
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          "zero",
          "zero"
        ]
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      "raw_glosses": [
        "(physics) The Lorentz frame in which the total momentum of a system is zero"
      ],
      "synonyms": [
        {
          "word": "rest frame"
        }
      ],
      "topics": [
        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
    }
  ],
  "word": "restframe"
}

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  "etymology_text": "From rest + frame.",
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        "(physics) The Lorentz frame in which the total momentum of a system is zero"
      ],
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        "natural-sciences",
        "physical-sciences",
        "physics"
      ]
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  ],
  "synonyms": [
    {
      "word": "rest frame"
    }
  ],
  "word": "restframe"
}