"PUR" meaning in English

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  "lang_code": "en",
  "pos": "noun",
  "senses": [
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      "alt_of": [
        {
          "word": "polyurethane"
        }
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          "langcode": "en",
          "name": "Organic chemistry",
          "orig": "en:Organic chemistry",
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            "Fundamental"
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      "glosses": [
        "Initialism of polyurethane."
      ],
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        [
          "organic chemistry",
          "organic chemistry"
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          "polyurethane",
          "polyurethane#English"
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      "raw_glosses": [
        "(organic chemistry) Initialism of polyurethane."
      ],
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      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "PUR"
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      "expansion": "PUR",
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "alt_of": [
        {
          "word": "polyurethane"
        }
      ],
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English initialisms",
        "English lemmas",
        "English nouns",
        "English nouns with unknown or uncertain plurals",
        "en:Organic chemistry"
      ],
      "glosses": [
        "Initialism of polyurethane."
      ],
      "links": [
        [
          "organic chemistry",
          "organic chemistry"
        ],
        [
          "polyurethane",
          "polyurethane#English"
        ]
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      "raw_glosses": [
        "(organic chemistry) Initialism of polyurethane."
      ],
      "tags": [
        "abbreviation",
        "alt-of",
        "initialism"
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      "topics": [
        "chemistry",
        "natural-sciences",
        "organic-chemistry",
        "physical-sciences"
      ]
    }
  ],
  "word": "PUR"
}