"methylpentene" meaning in English

{
  "forms": [
    {
      "form": "methylpentenes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
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      "expansion": "methylpentene (countable and uncountable, plural methylpentenes)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
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        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
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          "langcode": "en",
          "name": "Organic compounds",
          "orig": "en:Organic compounds",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "word": "polymethylpentene"
        }
      ],
      "glosses": [
        "Any methyl derivative of a pentene, but especially 4-methyl-1-pentene"
      ],
      "id": "en-methylpentene-en-noun-Cb0N2SwU",
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "methyl",
          "methyl"
        ],
        [
          "pentene",
          "pentene"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) Any methyl derivative of a pentene, but especially 4-methyl-1-pentene"
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "methylpentene"
}

{
  "derived": [
    {
      "word": "polymethylpentene"
    }
  ],
  "forms": [
    {
      "form": "methylpentenes",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "methylpentene (countable and uncountable, plural methylpentenes)",
      "name": "en-noun"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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        "English lemmas",
        "English nouns",
        "English uncountable nouns",
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        "Pages with entries",
        "en:Organic compounds"
      ],
      "glosses": [
        "Any methyl derivative of a pentene, but especially 4-methyl-1-pentene"
      ],
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "methyl",
          "methyl"
        ],
        [
          "pentene",
          "pentene"
        ]
      ],
      "raw_glosses": [
        "(organic chemistry) Any methyl derivative of a pentene, but especially 4-methyl-1-pentene"
      ],
      "tags": [
        "countable",
        "uncountable"
      ],
      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "methylpentene"
}