"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 retronyms",
          "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 German translations",
          "parents": [],
          "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": "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": "co-father"
    },
    {
      "word": "foster father"
    },
    {
      "word": "stepfather"
    },
    {
      "word": "surrogate father"
    }
  ],
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English retronyms",
        "Entries with translation boxes",
        "Pages with 1 entry",
        "Pages with entries",
        "Terms with German translations",
        "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"
}