"overstory" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "over",
        "3": "story"
      },
      "expansion": "over- + story",
      "name": "prefix"
    }
  ],
  "etymology_text": "From over- + story.",
  "forms": [
    {
      "form": "overstories",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "overstory (plural overstories)",
      "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": "English terms prefixed with over-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Plants",
          "orig": "en:Plants",
          "parents": [
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "The upper portion of a community of plants, above the understory."
      ],
      "id": "en-overstory-en-noun-zycoJC6y",
      "links": [
        [
          "understory",
          "understory"
        ]
      ],
      "synonyms": [
        {
          "word": "canopy"
        }
      ]
    }
  ],
  "word": "overstory"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "over",
        "3": "story"
      },
      "expansion": "over- + story",
      "name": "prefix"
    }
  ],
  "etymology_text": "From over- + story.",
  "forms": [
    {
      "form": "overstories",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "overstory (plural overstories)",
      "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",
        "English terms prefixed with over-",
        "Pages with 1 entry",
        "en:Plants"
      ],
      "glosses": [
        "The upper portion of a community of plants, above the understory."
      ],
      "links": [
        [
          "understory",
          "understory"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "canopy"
    }
  ],
  "word": "overstory"
}