"Foucault pendulum" meaning in English

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      "form": "Foucault pendulums",
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "Synonym of Foucault's pendulum"
      ],
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          "word": "Foucault's pendulum"
        }
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  ],
  "word": "Foucault pendulum"
}

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  "forms": [
    {
      "form": "Foucault pendulums",
      "tags": [
        "plural"
      ]
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      "expansion": "Foucault pendulum (plural Foucault pendulums)",
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  "lang_code": "en",
  "pos": "noun",
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      "glosses": [
        "Synonym of Foucault's pendulum"
      ],
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          "word": "Foucault's pendulum"
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  "word": "Foucault pendulum"
}