"processionary caterpillar" meaning in English

{
  "forms": [
    {
      "form": "processionary caterpillars",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
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      "args": {},
      "expansion": "processionary caterpillar (plural processionary caterpillars)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
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        },
        {
          "kind": "lifeform",
          "langcode": "en",
          "name": "Noctuoid moths",
          "orig": "en:Noctuoid moths",
          "parents": [
            "Moths",
            "Insects",
            "Arthropods",
            "Animals",
            "Lifeforms",
            "All topics",
            "Life",
            "Fundamental",
            "Nature"
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          "source": "w"
        }
      ],
      "glosses": [
        "The larval stage of some moths in the family Thaumetopoeidae, which move in columns in search of food, resembling a procession."
      ],
      "id": "en-processionary_caterpillar-en-noun-kD0MkfBa",
      "links": [
        [
          "larval",
          "larval"
        ],
        [
          "stage",
          "stage"
        ],
        [
          "moth",
          "moth"
        ],
        [
          "family",
          "family"
        ],
        [
          "Thaumetopoeidae",
          "Thaumetopoeidae#Translingual"
        ],
        [
          "column",
          "column"
        ],
        [
          "procession",
          "procession"
        ]
      ]
    }
  ],
  "word": "processionary caterpillar"
}

{
  "forms": [
    {
      "form": "processionary caterpillars",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "processionary caterpillar (plural processionary caterpillars)",
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  "lang_code": "en",
  "pos": "noun",
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        "en:Noctuoid moths"
      ],
      "glosses": [
        "The larval stage of some moths in the family Thaumetopoeidae, which move in columns in search of food, resembling a procession."
      ],
      "links": [
        [
          "larval",
          "larval"
        ],
        [
          "stage",
          "stage"
        ],
        [
          "moth",
          "moth"
        ],
        [
          "family",
          "family"
        ],
        [
          "Thaumetopoeidae",
          "Thaumetopoeidae#Translingual"
        ],
        [
          "column",
          "column"
        ],
        [
          "procession",
          "procession"
        ]
      ]
    }
  ],
  "word": "processionary caterpillar"
}