"essential nutrient" meaning in English

{
  "forms": [
    {
      "form": "essential nutrients",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "essential nutrient (plural essential nutrients)",
      "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": "Nutrition",
          "orig": "en:Nutrition",
          "parents": [
            "Health",
            "Body",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A compound that must be obtained from food for survival"
      ],
      "id": "en-essential_nutrient-en-noun-D-w9q4tz",
      "links": [
        [
          "nutrition",
          "nutrition"
        ],
        [
          "compound",
          "compound"
        ],
        [
          "food",
          "food"
        ]
      ],
      "qualifier": "nutrition",
      "raw_glosses": [
        "(nutrition) A compound that must be obtained from food for survival"
      ],
      "wikipedia": [
        "essential nutrient"
      ]
    }
  ],
  "word": "essential nutrient"
}

{
  "forms": [
    {
      "form": "essential nutrients",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "essential nutrient (plural essential nutrients)",
      "name": "en-noun"
    }
  ],
  "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",
        "en:Nutrition"
      ],
      "glosses": [
        "A compound that must be obtained from food for survival"
      ],
      "links": [
        [
          "nutrition",
          "nutrition"
        ],
        [
          "compound",
          "compound"
        ],
        [
          "food",
          "food"
        ]
      ],
      "qualifier": "nutrition",
      "raw_glosses": [
        "(nutrition) A compound that must be obtained from food for survival"
      ],
      "wikipedia": [
        "essential nutrient"
      ]
    }
  ],
  "word": "essential nutrient"
}