"field head" meaning in English

{
  "forms": [
    {
      "form": "field heads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "field head (plural field heads)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Construction",
          "orig": "en:Construction",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "langcode": "en",
          "name": "Metalworking",
          "orig": "en:Metalworking",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "The head formed by upsetting the bucktail of a rivet after it is inserted through the materials to be connected, as opposed to the factory head made when the rivet is manufactured; the field head of a solid rivet is typically pancake-shaped, depending on the shape of the bucking bar or other tool used to upset it. The field head of a blind rivet is typically doughnut-shaped."
      ],
      "id": "en-field_head-en-noun-Kk8XhL2Q",
      "links": [
        [
          "metalworking",
          "metalworking"
        ],
        [
          "construction",
          "construction"
        ],
        [
          "head",
          "head"
        ],
        [
          "bucktail",
          "bucktail"
        ],
        [
          "rivet",
          "rivet"
        ],
        [
          "factory head",
          "factory head"
        ],
        [
          "rivet",
          "rivet"
        ],
        [
          "bucking bar",
          "bucking bar"
        ],
        [
          "upset",
          "upset"
        ],
        [
          "blind rivet",
          "blind rivet"
        ]
      ],
      "raw_glosses": [
        "(metalworking, construction, of a rivet) The head formed by upsetting the bucktail of a rivet after it is inserted through the materials to be connected, as opposed to the factory head made when the rivet is manufactured; the field head of a solid rivet is typically pancake-shaped, depending on the shape of the bucking bar or other tool used to upset it. The field head of a blind rivet is typically doughnut-shaped."
      ],
      "raw_tags": [
        "of a rivet"
      ],
      "topics": [
        "arts",
        "business",
        "construction",
        "crafts",
        "engineering",
        "hobbies",
        "lifestyle",
        "manufacturing",
        "metallurgy",
        "metalworking",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "field head"
}

{
  "forms": [
    {
      "form": "field heads",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "field head (plural field heads)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Construction",
        "en:Metalworking"
      ],
      "glosses": [
        "The head formed by upsetting the bucktail of a rivet after it is inserted through the materials to be connected, as opposed to the factory head made when the rivet is manufactured; the field head of a solid rivet is typically pancake-shaped, depending on the shape of the bucking bar or other tool used to upset it. The field head of a blind rivet is typically doughnut-shaped."
      ],
      "links": [
        [
          "metalworking",
          "metalworking"
        ],
        [
          "construction",
          "construction"
        ],
        [
          "head",
          "head"
        ],
        [
          "bucktail",
          "bucktail"
        ],
        [
          "rivet",
          "rivet"
        ],
        [
          "factory head",
          "factory head"
        ],
        [
          "rivet",
          "rivet"
        ],
        [
          "bucking bar",
          "bucking bar"
        ],
        [
          "upset",
          "upset"
        ],
        [
          "blind rivet",
          "blind rivet"
        ]
      ],
      "raw_glosses": [
        "(metalworking, construction, of a rivet) The head formed by upsetting the bucktail of a rivet after it is inserted through the materials to be connected, as opposed to the factory head made when the rivet is manufactured; the field head of a solid rivet is typically pancake-shaped, depending on the shape of the bucking bar or other tool used to upset it. The field head of a blind rivet is typically doughnut-shaped."
      ],
      "raw_tags": [
        "of a rivet"
      ],
      "topics": [
        "arts",
        "business",
        "construction",
        "crafts",
        "engineering",
        "hobbies",
        "lifestyle",
        "manufacturing",
        "metallurgy",
        "metalworking",
        "natural-sciences",
        "physical-sciences"
      ]
    }
  ],
  "word": "field head"
}