"bronto-" meaning in English

{
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      "expansion": "",
      "name": "cln"
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    {
      "args": {
        "1": "en",
        "2": "grc",
        "3": "βροντή",
        "4": "",
        "5": "thunder"
      },
      "expansion": "Ancient Greek βροντή (brontḗ, “thunder”)",
      "name": "uder"
    }
  ],
  "etymology_text": "Ancient Greek βροντή (brontḗ, “thunder”)",
  "head_templates": [
    {
      "args": {
        "1": "en",
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        "head": "",
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      "expansion": "bronto-",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "bronto-",
      "name": "en-prefix"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "thunder"
      ],
      "id": "en-bronto--en-prefix-Se~3R~e2",
      "links": [
        [
          "thunder",
          "thunder"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        {
          "_dis": "0 100",
          "kind": "other",
          "name": "English undefined derivations",
          "parents": [
            "Undefined derivations",
            "Entry maintenance"
          ],
          "source": "w+disamb"
        }
      ],
      "glosses": [
        "Synonym of ronna-"
      ],
      "id": "en-bronto--en-prefix-LHlOW~K0",
      "links": [
        [
          "ronna-",
          "ronna-#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Synonym of ronna-"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "ronna-"
        }
      ],
      "tags": [
        "informal",
        "morpheme"
      ]
    }
  ],
  "word": "bronto-"
}

{
  "categories": [
    "English lemmas",
    "English prefixes",
    "English terms derived from Ancient Greek",
    "English undefined derivations"
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        "2": "grc",
        "3": "βροντή",
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        "5": "thunder"
      },
      "expansion": "Ancient Greek βροντή (brontḗ, “thunder”)",
      "name": "uder"
    }
  ],
  "etymology_text": "Ancient Greek βροντή (brontḗ, “thunder”)",
  "head_templates": [
    {
      "args": {
        "1": "en",
        "2": "prefix",
        "head": "",
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      "expansion": "bronto-",
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    },
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      "args": {},
      "expansion": "bronto-",
      "name": "en-prefix"
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  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "prefix",
  "senses": [
    {
      "glosses": [
        "thunder"
      ],
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        [
          "thunder",
          "thunder"
        ]
      ],
      "tags": [
        "morpheme"
      ]
    },
    {
      "categories": [
        "English informal terms"
      ],
      "glosses": [
        "Synonym of ronna-"
      ],
      "links": [
        [
          "ronna-",
          "ronna-#English"
        ]
      ],
      "raw_glosses": [
        "(informal) Synonym of ronna-"
      ],
      "synonyms": [
        {
          "tags": [
            "synonym",
            "synonym-of"
          ],
          "word": "ronna-"
        }
      ],
      "tags": [
        "informal",
        "morpheme"
      ]
    }
  ],
  "word": "bronto-"
}