"black elder" meaning in English

{
  "forms": [
    {
      "form": "black elders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "black elder (plural black elders)",
      "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": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Moschatel family plants",
          "orig": "en:Moschatel family plants",
          "parents": [
            "Plants",
            "Shrubs",
            "Trees",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "Sambucus nigra"
      ],
      "id": "en-black_elder-en-noun-ocdvoigo",
      "links": [
        [
          "Sambucus nigra",
          "Sambucus nigra#Translingual"
        ]
      ],
      "synonyms": [
        {
          "sense": "Sambucus nigra",
          "word": "elder"
        }
      ],
      "wikipedia": [
        "en:black elder"
      ]
    }
  ],
  "word": "black elder"
}

{
  "forms": [
    {
      "form": "black elders",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "black elder (plural black elders)",
      "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",
        "Pages with 1 entry",
        "Pages with entries",
        "en:Moschatel family plants"
      ],
      "glosses": [
        "Sambucus nigra"
      ],
      "links": [
        [
          "Sambucus nigra",
          "Sambucus nigra#Translingual"
        ]
      ],
      "wikipedia": [
        "en:black elder"
      ]
    }
  ],
  "synonyms": [
    {
      "sense": "Sambucus nigra",
      "word": "elder"
    }
  ],
  "word": "black elder"
}