"birth father" meaning in English

{
  "etymology_text": "By extension from birth mother.",
  "forms": [
    {
      "form": "birth fathers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "birth father (plural birth fathers)",
      "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 entries with language name categories using raw markup",
          "parents": [
            "Entries with language name categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English entries with topic categories using raw markup",
          "parents": [
            "Entries with topic categories using raw markup",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English retronyms",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "English terms with non-redundant non-automated sortkeys",
          "parents": [
            "Terms with non-redundant non-automated sortkeys",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "topical",
          "langcode": "en",
          "name": "Parents",
          "orig": "en:Parents",
          "parents": [
            "Family members",
            "Family",
            "People",
            "Human",
            "All topics",
            "Fundamental"
          ],
          "source": "w"
        }
      ],
      "coordinate_terms": [
        {
          "word": "birth mother"
        },
        {
          "word": "birth parent"
        }
      ],
      "glosses": [
        "The genetic father of a child (as opposed to an adoptive father or stepfather)."
      ],
      "id": "en-birth_father-en-noun-xarOprhS",
      "links": [
        [
          "genetic",
          "genetic"
        ],
        [
          "adoptive father",
          "adoptive father"
        ],
        [
          "stepfather",
          "stepfather"
        ]
      ],
      "related": [
        {
          "word": "adoptive father"
        },
        {
          "word": "biological father"
        },
        {
          "word": "co-father"
        },
        {
          "word": "foster father"
        },
        {
          "word": "stepfather"
        },
        {
          "word": "surrogate father"
        }
      ],
      "synonyms": [
        {
          "word": "birthfather"
        }
      ],
      "translations": [
        {
          "code": "de",
          "lang": "German",
          "sense": "birth father",
          "tags": [
            "masculine"
          ],
          "word": "biologischer Vater"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "birth father",
          "tags": [
            "masculine"
          ],
          "word": "leiblicher Vater"
        },
        {
          "code": "de",
          "lang": "German",
          "sense": "birth father",
          "tags": [
            "masculine"
          ],
          "word": "natürlicher Vater"
        }
      ]
    }
  ],
  "word": "birth father"
}

{
  "coordinate_terms": [
    {
      "word": "birth mother"
    },
    {
      "word": "birth parent"
    }
  ],
  "etymology_text": "By extension from birth mother.",
  "forms": [
    {
      "form": "birth fathers",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {},
      "expansion": "birth father (plural birth fathers)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "adoptive father"
    },
    {
      "word": "biological father"
    },
    {
      "word": "co-father"
    },
    {
      "word": "foster father"
    },
    {
      "word": "stepfather"
    },
    {
      "word": "surrogate father"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English entries with language name categories using raw markup",
        "English entries with topic categories using raw markup",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English retronyms",
        "English terms with non-redundant non-automated sortkeys",
        "en:Parents"
      ],
      "glosses": [
        "The genetic father of a child (as opposed to an adoptive father or stepfather)."
      ],
      "links": [
        [
          "genetic",
          "genetic"
        ],
        [
          "adoptive father",
          "adoptive father"
        ],
        [
          "stepfather",
          "stepfather"
        ]
      ]
    }
  ],
  "synonyms": [
    {
      "word": "birthfather"
    }
  ],
  "translations": [
    {
      "code": "de",
      "lang": "German",
      "sense": "birth father",
      "tags": [
        "masculine"
      ],
      "word": "biologischer Vater"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "birth father",
      "tags": [
        "masculine"
      ],
      "word": "leiblicher Vater"
    },
    {
      "code": "de",
      "lang": "German",
      "sense": "birth father",
      "tags": [
        "masculine"
      ],
      "word": "natürlicher Vater"
    }
  ],
  "word": "birth father"
}