"héliomètres" meaning in French

{
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "noun form",
        "g": "m"
      },
      "expansion": "héliomètres m",
      "name": "head"
    }
  ],
  "hyphenation": [
    "hé‧lio‧mètres"
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "French entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "French terms with mute h",
          "parents": [],
          "source": "w"
        }
      ],
      "form_of": [
        {
          "word": "héliomètre"
        }
      ],
      "glosses": [
        "plural of héliomètre"
      ],
      "id": "en-héliomètres-fr-noun-V9LY7ymi",
      "links": [
        [
          "héliomètre",
          "héliomètre#French"
        ]
      ],
      "tags": [
        "form-of",
        "masculine",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/e.ljɔ.mɛtʁ/"
    },
    {
      "homophone": "héliomètre"
    }
  ],
  "word": "héliomètres"
}

{
  "head_templates": [
    {
      "args": {
        "1": "fr",
        "2": "noun form",
        "g": "m"
      },
      "expansion": "héliomètres m",
      "name": "head"
    }
  ],
  "hyphenation": [
    "hé‧lio‧mètres"
  ],
  "lang": "French",
  "lang_code": "fr",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "French 3-syllable words",
        "French entries with incorrect language header",
        "French non-lemma forms",
        "French noun forms",
        "French terms with IPA pronunciation",
        "French terms with homophones",
        "French terms with mute h"
      ],
      "form_of": [
        {
          "word": "héliomètre"
        }
      ],
      "glosses": [
        "plural of héliomètre"
      ],
      "links": [
        [
          "héliomètre",
          "héliomètre#French"
        ]
      ],
      "tags": [
        "form-of",
        "masculine",
        "plural"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "/e.ljɔ.mɛtʁ/"
    },
    {
      "homophone": "héliomètre"
    }
  ],
  "word": "héliomètres"
}