"proof planes" meaning in All languages combined

{
  "head_templates": [
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      "args": {
        "1": "en",
        "2": "noun form"
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      "expansion": "proof planes",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
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          "source": "w"
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      "form_of": [
        {
          "word": "proof plane"
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      ],
      "glosses": [
        "plural of proof plane"
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      "id": "en-proof_planes-en-noun-hHQ5WMjZ",
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  "word": "proof planes"
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{
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    {
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        "1": "en",
        "2": "noun form"
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      "expansion": "proof planes",
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  "lang_code": "en",
  "pos": "noun",
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        {
          "word": "proof plane"
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  "word": "proof planes"
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