"18-wheeler" meaning in English

{
  "etymology_text": "From the total number of wheels: two front steering wheels on the tractor, plus dual wheels on each end of two axles (total of 8) at the rear of the tractor and supporting the front of the trailer, plus dual wheels on two axles at the rear of the trailer.",
  "forms": [
    {
      "form": "18-wheelers",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "eighteen-wheeler",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "18-wheeler (plural 18-wheelers)",
      "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"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Eighteen",
          "orig": "en:Eighteen",
          "parents": [
            "Numbers",
            "All topics",
            "Terms by semantic function",
            "Fundamental"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Vehicles",
          "orig": "en:Vehicles",
          "parents": [
            "Machines",
            "Transport",
            "Technology",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A big rig truck: a semi-trailer plus the truck or tractor pulling it."
      ],
      "id": "en-18-wheeler-en-noun-AJuPv1rq",
      "links": [
        [
          "big rig",
          "big rig"
        ],
        [
          "semi-trailer",
          "semi-trailer"
        ],
        [
          "truck",
          "truck"
        ],
        [
          "tractor",
          "tractor"
        ]
      ],
      "synonyms": [
        {
          "word": "semi-trailer truck"
        },
        {
          "word": "semi truck"
        },
        {
          "word": "semi"
        },
        {
          "word": "articulated lorry"
        },
        {
          "word": "artic"
        },
        {
          "word": "big rig"
        },
        {
          "word": "juggernaut"
        },
        {
          "word": "tractor-trailer"
        },
        {
          "word": "truck and trailer"
        }
      ]
    }
  ],
  "word": "18-wheeler"
}

{
  "etymology_text": "From the total number of wheels: two front steering wheels on the tractor, plus dual wheels on each end of two axles (total of 8) at the rear of the tractor and supporting the front of the trailer, plus dual wheels on two axles at the rear of the trailer.",
  "forms": [
    {
      "form": "18-wheelers",
      "tags": [
        "plural"
      ]
    },
    {
      "form": "eighteen-wheeler",
      "tags": [
        "alternative"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "18-wheeler (plural 18-wheelers)",
      "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 terms spelled with numbers",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Eighteen",
        "en:Vehicles"
      ],
      "glosses": [
        "A big rig truck: a semi-trailer plus the truck or tractor pulling it."
      ],
      "links": [
        [
          "big rig",
          "big rig"
        ],
        [
          "semi-trailer",
          "semi-trailer"
        ],
        [
          "truck",
          "truck"
        ],
        [
          "tractor",
          "tractor"
        ]
      ],
      "synonyms": [
        {
          "word": "semi-trailer truck"
        },
        {
          "word": "semi truck"
        },
        {
          "word": "semi"
        },
        {
          "word": "articulated lorry"
        },
        {
          "word": "artic"
        },
        {
          "word": "big rig"
        },
        {
          "word": "juggernaut"
        },
        {
          "word": "tractor-trailer"
        },
        {
          "word": "truck and trailer"
        }
      ]
    }
  ],
  "word": "18-wheeler"
}