"blister steel" meaning in English

{
  "etymology_text": "From its blistered surface.",
  "forms": [
    {
      "form": "blister steels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "blister steel (countable and uncountable, plural blister steels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Crude steel formed from wrought iron by cementation."
      ],
      "id": "en-blister_steel-en-noun-XpppYNro",
      "links": [
        [
          "wrought iron",
          "wrought iron"
        ],
        [
          "cementation",
          "cementation"
        ]
      ],
      "synonyms": [
        {
          "word": "cement steel"
        },
        {
          "word": "blistered steel"
        }
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "wikipedia": [
        "blister steel"
      ]
    }
  ],
  "word": "blister steel"
}

{
  "etymology_text": "From its blistered surface.",
  "forms": [
    {
      "form": "blister steels",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "blister steel (countable and uncountable, plural blister steels)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English uncountable nouns"
      ],
      "glosses": [
        "Crude steel formed from wrought iron by cementation."
      ],
      "links": [
        [
          "wrought iron",
          "wrought iron"
        ],
        [
          "cementation",
          "cementation"
        ]
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "wikipedia": [
        "blister steel"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "cement steel"
    },
    {
      "word": "blistered steel"
    }
  ],
  "word": "blister steel"
}