"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": "English entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A concrete barrier used to separate lanes of traffic."
      ],
      "hyponyms": [
        {
          "word": "Jersey barrier"
        },
        {
          "word": "Jersey bump"
        },
        {
          "word": "Jersey curb"
        },
        {
          "word": "Jersey wall"
        },
        {
          "word": "Ontario tall wall"
        },
        {
          "word": "F-shape barrier"
        },
        {
          "word": "constant-slope barrier"
        },
        {
          "word": "concrete step barrier"
        }
      ],
      "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": "Jersey barrier"
    },
    {
      "word": "Jersey bump"
    },
    {
      "word": "Jersey curb"
    },
    {
      "word": "Jersey wall"
    },
    {
      "word": "Ontario tall wall"
    },
    {
      "word": "F-shape barrier"
    },
    {
      "word": "constant-slope barrier"
    },
    {
      "word": "concrete step barrier"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms derived from the shape of letters",
        "English terms with non-redundant non-automated sortkeys"
      ],
      "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"
}