"K-rail" meaning in English

{
  "etymology_text": "This term is stipulated in a specification of the California Department of Transportation, who first started using concrete median barriers in the mid-1940s. The reason for the letter K is uncertain.",
  "forms": [
    {
      "form": "K-rails",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "K-rail (plural K-rails)",
      "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"
        }
      ],
      "glosses": [
        "A concrete barrier used to separate lanes of traffic."
      ],
      "hyponyms": [
        {
          "word": "concrete step barrier"
        },
        {
          "word": "constant-slope barrier"
        },
        {
          "word": "F-shape barrier"
        },
        {
          "word": "Jersey barrier"
        },
        {
          "word": "Jersey bump"
        },
        {
          "word": "Jersey curb"
        },
        {
          "word": "Jersey wall"
        },
        {
          "word": "Ontario tall wall"
        }
      ],
      "id": "en-K-rail-en-noun-HToaKbK-",
      "links": [
        [
          "concrete",
          "concrete#English"
        ],
        [
          "barrier",
          "barrier#English"
        ],
        [
          "traffic",
          "traffic#English"
        ]
      ],
      "synonyms": [
        {
          "word": "Jersey barrier"
        },
        {
          "word": "parabolic concrete barrier"
        }
      ]
    }
  ],
  "word": "K-rail"
}

{
  "etymology_text": "This term is stipulated in a specification of the California Department of Transportation, who first started using concrete median barriers in the mid-1940s. The reason for the letter K is uncertain.",
  "forms": [
    {
      "form": "K-rails",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "K-rail (plural K-rails)",
      "name": "en-noun"
    }
  ],
  "hyponyms": [
    {
      "word": "concrete step barrier"
    },
    {
      "word": "constant-slope barrier"
    },
    {
      "word": "F-shape barrier"
    },
    {
      "word": "Jersey barrier"
    },
    {
      "word": "Jersey bump"
    },
    {
      "word": "Jersey curb"
    },
    {
      "word": "Jersey wall"
    },
    {
      "word": "Ontario tall wall"
    }
  ],
  "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 derived from the shape of letters",
        "Pages with 1 entry",
        "Pages with entries"
      ],
      "glosses": [
        "A concrete barrier used to separate lanes of traffic."
      ],
      "links": [
        [
          "concrete",
          "concrete#English"
        ],
        [
          "barrier",
          "barrier#English"
        ],
        [
          "traffic",
          "traffic#English"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "Jersey barrier"
    },
    {
      "word": "parabolic concrete barrier"
    }
  ],
  "word": "K-rail"
}