"sub-element" meaning in English

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "element"
      },
      "expansion": "sub- + element",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + element.",
  "forms": [
    {
      "form": "sub-elements",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sub-element (plural sub-elements)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms prefixed with sub-",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Entries with translation boxes",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with 1 entry",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Pages with entries",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Terms with French translations",
          "parents": [],
          "source": "w"
        }
      ],
      "glosses": [
        "A subordinate or secondary element."
      ],
      "id": "en-sub-element-en-noun-VSaQ5p9i",
      "translations": [
        {
          "code": "fr",
          "lang": "French",
          "lang_code": "fr",
          "sense": "A subordinate or secondary element",
          "tags": [
            "masculine"
          ],
          "word": "sous-élément"
        }
      ]
    }
  ],
  "word": "sub-element"
}

{
  "etymology_templates": [
    {
      "args": {
        "1": "en",
        "2": "sub",
        "3": "element"
      },
      "expansion": "sub- + element",
      "name": "prefix"
    }
  ],
  "etymology_text": "From sub- + element.",
  "forms": [
    {
      "form": "sub-elements",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "sub-element (plural sub-elements)",
      "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",
        "English terms prefixed with sub-",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with French translations"
      ],
      "glosses": [
        "A subordinate or secondary element."
      ]
    }
  ],
  "translations": [
    {
      "code": "fr",
      "lang": "French",
      "lang_code": "fr",
      "sense": "A subordinate or secondary element",
      "tags": [
        "masculine"
      ],
      "word": "sous-élément"
    }
  ],
  "word": "sub-element"
}