"HNEL" meaning in English

{
  "forms": [
    {
      "form": "HNELs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "HNEL (plural HNELs)",
      "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": "topical",
          "langcode": "en",
          "name": "Toxicology",
          "orig": "en:Toxicology",
          "parents": [
            "Medicine",
            "Pharmacology",
            "Biology",
            "Sciences",
            "Biochemistry",
            "All topics",
            "Chemistry",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Highest no-effect level, the highest level of exposure to a substance at which there are no adverse effects on test subjects."
      ],
      "id": "en-HNEL-en-noun-374wCwT7",
      "links": [
        [
          "toxicology",
          "toxicology"
        ]
      ],
      "raw_glosses": [
        "(toxicology) Highest no-effect level, the highest level of exposure to a substance at which there are no adverse effects on test subjects."
      ],
      "synonyms": [
        {
          "word": "NOAEL"
        }
      ],
      "topics": [
        "medicine",
        "sciences",
        "toxicology"
      ]
    }
  ],
  "word": "HNEL"
}

{
  "forms": [
    {
      "form": "HNELs",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "HNEL (plural HNELs)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English nouns",
        "en:Toxicology"
      ],
      "glosses": [
        "Highest no-effect level, the highest level of exposure to a substance at which there are no adverse effects on test subjects."
      ],
      "links": [
        [
          "toxicology",
          "toxicology"
        ]
      ],
      "raw_glosses": [
        "(toxicology) Highest no-effect level, the highest level of exposure to a substance at which there are no adverse effects on test subjects."
      ],
      "topics": [
        "medicine",
        "sciences",
        "toxicology"
      ]
    }
  ],
  "synonyms": [
    {
      "word": "NOAEL"
    }
  ],
  "word": "HNEL"
}