"case hardened" meaning in English

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  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
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      "form_of": [
        {
          "word": "case harden"
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      "glosses": [
        "simple past and past participle of case harden"
      ],
      "id": "en-case_hardened-en-verb-MkiWZiIu",
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          "case harden",
          "case harden#English"
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        {
          "_dis1": "64 36",
          "word": "case-hardened"
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        "participle",
        "past"
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  "word": "case hardened"
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{
  "forms": [
    {
      "form": "more case hardened",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most case hardened",
      "tags": [
        "superlative"
      ]
    }
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      "expansion": "case hardened (comparative more case hardened, superlative most case hardened)",
      "name": "en-adj"
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
    {
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        {
          "kind": "topical",
          "langcode": "en",
          "name": "Metallurgy",
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      ],
      "glosses": [
        "Metal that is harder at its surface, due to a case hardening process."
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          "surface",
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          "case hardening",
          "case hardening"
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      ],
      "raw_glosses": [
        "(metallurgy) Metal that is harder at its surface, due to a case hardening process."
      ],
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        "engineering",
        "metallurgy",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "case hardened"
}

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  "lang": "English",
  "lang_code": "en",
  "pos": "verb",
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          "word": "case harden"
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      "glosses": [
        "simple past and past participle of case harden"
      ],
      "links": [
        [
          "case harden",
          "case harden#English"
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  ],
  "synonyms": [
    {
      "word": "case-hardened"
    }
  ],
  "word": "case hardened"
}

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    "English verb forms",
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    "Pages with entries"
  ],
  "forms": [
    {
      "form": "more case hardened",
      "tags": [
        "comparative"
      ]
    },
    {
      "form": "most case hardened",
      "tags": [
        "superlative"
      ]
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      "expansion": "case hardened (comparative more case hardened, superlative most case hardened)",
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  "lang": "English",
  "lang_code": "en",
  "pos": "adj",
  "senses": [
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      "glosses": [
        "Metal that is harder at its surface, due to a case hardening process."
      ],
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          "case hardening",
          "case hardening"
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        "(metallurgy) Metal that is harder at its surface, due to a case hardening process."
      ],
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        "engineering",
        "metallurgy",
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        "physical-sciences"
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  "synonyms": [
    {
      "word": "case-hardened"
    }
  ],
  "word": "case hardened"
}