"quy đầu" meaning in Vietnamese

{
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "龜",
        "2": "turtle",
        "3": "頭",
        "4": "head"
      },
      "expansion": "Sino-Vietnamese word from 龜頭, composed of 龜 (“turtle”) and 頭 (“head”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 龜頭, composed of 龜 (“turtle”) and 頭 (“head”).",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "quy đầu",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "quy đầu",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "Sino-Vietnamese words",
          "parents": [],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        },
        {
          "kind": "other",
          "name": "Vietnamese nouns without classifiers",
          "parents": [],
          "source": "w"
        }
      ],
      "derived": [
        {
          "english": "foreskin",
          "word": "bao quy đầu"
        }
      ],
      "glosses": [
        "glans penis"
      ],
      "id": "en-quy_đầu-vi-noun-wX70Hzki",
      "links": [
        [
          "glans penis",
          "glans penis"
        ]
      ],
      "raw_glosses": [
        "(formal, polite) glans penis"
      ],
      "synonyms": [
        {
          "word": "đầu khấc"
        },
        {
          "word": "đầu buồi"
        },
        {
          "word": "qui đầu"
        }
      ],
      "tags": [
        "formal",
        "polite"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[kwi˧˧ ʔɗəw˨˩]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[kwɪj˧˧ ʔɗəw˦˩]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[wɪj˧˧ ʔɗəw˨˩]",
      "note": "Saigon"
    }
  ],
  "word": "quy đầu"
}

{
  "derived": [
    {
      "english": "foreskin",
      "word": "bao quy đầu"
    }
  ],
  "etymology_templates": [
    {
      "args": {
        "1": "vi",
        "2": "Sino-Vietnamese words"
      },
      "expansion": "",
      "name": "categorize"
    },
    {
      "args": {
        "1": "龜",
        "2": "turtle",
        "3": "頭",
        "4": "head"
      },
      "expansion": "Sino-Vietnamese word from 龜頭, composed of 龜 (“turtle”) and 頭 (“head”)",
      "name": "vi-etym-sino"
    }
  ],
  "etymology_text": "Sino-Vietnamese word from 龜頭, composed of 龜 (“turtle”) and 頭 (“head”).",
  "head_templates": [
    {
      "args": {
        "1": "vi",
        "2": "noun",
        "3": "",
        "4": "",
        "head": "",
        "tr": ""
      },
      "expansion": "quy đầu",
      "name": "head"
    },
    {
      "args": {},
      "expansion": "quy đầu",
      "name": "vi-noun"
    }
  ],
  "lang": "Vietnamese",
  "lang_code": "vi",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "Sino-Vietnamese words",
        "Vietnamese entries with incorrect language header",
        "Vietnamese formal terms",
        "Vietnamese lemmas",
        "Vietnamese nouns",
        "Vietnamese nouns without classifiers",
        "Vietnamese polite terms",
        "Vietnamese terms with IPA pronunciation"
      ],
      "glosses": [
        "glans penis"
      ],
      "links": [
        [
          "glans penis",
          "glans penis"
        ]
      ],
      "raw_glosses": [
        "(formal, polite) glans penis"
      ],
      "synonyms": [
        {
          "word": "đầu khấc"
        },
        {
          "word": "đầu buồi"
        }
      ],
      "tags": [
        "formal",
        "polite"
      ]
    }
  ],
  "sounds": [
    {
      "ipa": "[kwi˧˧ ʔɗəw˨˩]",
      "tags": [
        "Hà-Nội"
      ]
    },
    {
      "ipa": "[kwɪj˧˧ ʔɗəw˦˩]",
      "tags": [
        "Huế"
      ]
    },
    {
      "ipa": "[wɪj˧˧ ʔɗəw˨˩]",
      "note": "Saigon"
    }
  ],
  "synonyms": [
    {
      "word": "qui đầu"
    }
  ],
  "word": "quy đầu"
}