"51-" meaning in All languages combined

{
  "etymology_text": "From AISI and SAE standards nomenclature for iron and steel grades for chromium steels with roughly 1% chromium.",
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  "lang": "Translingual",
  "lang_code": "mul",
  "pos": "prefix",
  "senses": [
    {
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          "name": "Pages using catfix",
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        {
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          "langcode": "mul",
          "name": "Metallurgy",
          "orig": "mul:Metallurgy",
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      ],
      "glosses": [
        "Identifying a chromium steel grade with roughly 1% chromium, and a varying amount of carbon."
      ],
      "id": "en-51--mul-prefix-lKqGeheS",
      "links": [
        [
          "metallurgy",
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        ]
      ],
      "raw_glosses": [
        "(metallurgy) Identifying a chromium steel grade with roughly 1% chromium, and a varying amount of carbon."
      ],
      "tags": [
        "morpheme"
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        "engineering",
        "metallurgy",
        "natural-sciences",
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  ],
  "word": "51-"
}

{
  "etymology_text": "From AISI and SAE standards nomenclature for iron and steel grades for chromium steels with roughly 1% chromium.",
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        "mul:Metallurgy"
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      "glosses": [
        "Identifying a chromium steel grade with roughly 1% chromium, and a varying amount of carbon."
      ],
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      "raw_glosses": [
        "(metallurgy) Identifying a chromium steel grade with roughly 1% chromium, and a varying amount of carbon."
      ],
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}