*SET-U

English word origin

Etymology of bro

PIE word *bʰréh₂tēr Etymology tree Proto-Indo-European *bʰréh₂tēr Proto-Germanic *brōþēr Proto-West Germanic *brōþer Old English brōþor Middle English brother English brotherclip. English bro Spelling pronunciation and c

1 source sectionExtended source reportWiktionary original ↗
In this entry · 1 source sections

The source etymologies

Wiktionary via Kaikki / Wiktextract

The source reports below are imported and unreviewed by *SET-U. Separate numbered origins and differing source variants are preserved; agreement within this extraction is not independent corroboration.

Unnumbered source etymology

Original entry ↗
noun

Brother (a male sibling). · Brother (a comrade or friend; one who shares one’s ideals). · Brother, my man, good sir; a friendly term of address for typically men. · A frat boy or someone who espouses the fraternity bro culture.

Selected source glosses provide context, not a complete modern definition inventory

PIE word *bʰréh₂tēr Etymology tree Proto-Indo-European *bʰréh₂tēr Proto-Germanic *brōþēr Proto-West Germanic *brōþer Old English brōþor Middle English brother English brotherclip. English bro Spelling pronunciation and clipping of brother. (Contrast bruh, which is a clipping of the pronunciation of brother rather than the spelling.) Compare Swedish bror.

Relationships mentioned by the source

These are extracted mentions, not a timeline or a verified sequence of immediate parents.

  • Cognate mentionbrorsv

This page abbreviates 1 auxiliary source items. The etymology narrative is not shortened. Omission counts are available in the audit fields below; consult the original for complete auxiliary material.

Inspect preserved source fields

Raw extraction fields are retained for auditing. Their order does not establish ancestry.

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        "2": "ine-pro"
      },
      "expansion": ""
    },
    {
      "name": "langname",
      "args": {
        "1": "ine-pro"
      },
      "expansion": "Proto-Indo-European"
    },
    {
      "name": "word",
      "args": {
        "1": "en",
        "2": "ine",
        "3": "bʰréh₂tēr",
        "id": ""
      },
      "expansion": ""
    },
    {
      "name": "PIE word",
      "args": {
        "1": "en",
        "2": "bʰréh₂tēr"
      },
      "expansion": "PIE word\n *bʰréh₂tēr"
    },
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":clip",
        "3": "brother<id:male sibling>",
        "id": "brother",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *bʰréh₂tēr\nProto-Germanic *brōþēr\nProto-West Germanic *brōþer\nOld English brōþor\nMiddle English brother\nEnglish brotherclip.\nEnglish bro\n[Appendix:Glossary#clipping|Clipping]] of\", \"terms\" : [ { \"id\" : \"male sibling\", \"children\" : [ { \"terms\" : [ { \"id\" : \"male sibling\", \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ { \"terms\" : [ { \"children\" : [ ], \"lang_name\" : \"Proto-Indo-European\", \"term\" : \"*bʰréh₂tēr\", \"status\" : \"ok\", \"lang\" : \"ine-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-Germanic\", \"term\" : \"*brōþēr\", \"status\" : \"ok\", \"lang\" : \"gem-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Proto-West Germanic\", \"term\" : \"*brōþer\", \"status\" : \"ok\", \"lang\" : \"gmw-pro\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"lang_name\" : \"Old English\", \"term\" : \"brōþor\", \"status\" : \"ok\", \"lang\" : \"ang\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"Middle English\", \"term\" : \"brother\", \"lang\" : \"enm\" } ], \"keyword_label\" : \"Inherited from\", \"keyword\" : \"inherited\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"brother\", \"lang\" : \"en\" } ], \"keyword\" : \"clipping\" } ], \"status\" : \"ok\", \"lang_name\" : \"English\", \"term\" : \"bro\", \"lang\" : \"en\" }\" data-id=\"brother\" data-lang=\"en\" data-title=\"bro\" id=\"English:_brother\">"
    },
    {
      "name": "spelling pronunciation",
      "args": {
        "1": "en"
      },
      "expansion": "Spelling pronunciation"
    },
    {
      "name": "clipping",
      "args": {
        "1": "en",
        "2": "brother",
        "nocap": "1"
      },
      "expansion": "clipping of brother"
    },
    {
      "name": "cog",
      "args": {
        "1": "sv",
        "2": "bror"
      },
      "expansion": "Swedish bror"
    },
    {
      "name": "etymon",
      "args": {
        "1": "en",
        "2": ":clip",
        "3": "brother<id:male sibling>",
        "id": "brother",
        "tree": "1"
      },
      "expansion": "Etymology tree\nProto-Indo-European *bʰréh₂tēr\nProto-Germanic *brōþēr\nProto-West Germanic *brōþer\nOld English brōþor\nMiddle English brother\nEnglish brotherclip.\nEnglish bro"
    }
  ],
  "links": [
    [
      "*bʰréh₂tēr",
      "Reconstruction:Proto-Indo-European/bʰréh₂tēr"
    ],
    [
      "*bʰréh₂tēr",
      "Reconstruction:Proto-Indo-European/bʰréh₂tēr"
    ],
    [
      "*brōþēr",
      "Reconstruction:Proto-Germanic/brōþēr"
    ],
    [
      "*brōþer",
      "Reconstruction:Proto-West Germanic/brōþer"
    ],
    [
      "brōþor",
      "broþor#Old_English"
    ],
    [
      "brother",
      "brother#Middle_English:_male_sibling"
    ],
    [
      "brother",
      "brother#English:_male_sibling"
    ],
    [
      "brother",
      "brother#English"
    ],
    [
      "bruh",
      "bruh#English"
    ],
    [
      "brother",
      "brother#English"
    ],
    [
      "bror",
      "bror#Swedish"
    ]
  ],
  "references": [],
  "descendants": [
    {
      "lang": "Arabic",
      "lang_code": "ar",
      "word": "بْرُو",
      "raw_tags": [
        "borrowed"
      ],
      "roman": "brō"
    },
    {
      "lang": "Arabic",
      "lang_code": "ar",
      "word": "بْرُوه",
      "raw_tags": [
        "borrowed"
      ],
      "roman": "brō, brōh",
      "tags": [
        "slang"
      ]
    },
    {
      "lang": "Chinese",
      "lang_code": "zh",
      "word": "bro",
      "raw_tags": [
        "borrowed"
      ],
      "tags": [
        "slang"
      ]
    },
    {
      "lang": "Italian",
      "lang_code": "it",
      "word": "bro",
      "raw_tags": [
        "borrowed"
      ],
      "tags": [
        "slang"
      ]
    },
    {
      "lang": "Russian",
      "lang_code": "ru",
      "word": "бро",
      "raw_tags": [
        "borrowed"
      ],
      "roman": "bro",
      "tags": [
        "slang"
      ]
    },
    {
      "lang": "Spanish",
      "lang_code": "es",
      "word": "bro",
      "raw_tags": [
        "borrowed"
      ],
      "tags": [
        "slang"
      ]
    },
    {
      "lang": "Ukrainian",
      "lang_code": "uk",
      "word": "бро",
      "raw_tags": [
        "borrowed"
      ],
      "roman": "bro",
      "tags": [
        "slang"
      ]
    },
    {
      "lang": "Vietnamese",
      "lang_code": "vi",
      "word": "bro",
      "raw_tags": [
        "borrowed"
      ],
      "tags": [
        "slang"
      ]
    }
  ],
  "lexical": [
    {
      "pos": "noun",
      "glosses": [
        "Brother (a male sibling).",
        "Brother (a comrade or friend; one who shares one’s ideals).",
        "Brother, my man, good sir; a friendly term of address for typically men.",
        "A frat boy or someone who espouses the fraternity bro culture."
      ],
      "tags": [
        "slang"
      ],
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      "sourceRecordOrdinal": 208167
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  ],
  "omittedAuxiliaryFields": {
    "templates": 0,
    "links": 0,
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    "descendants": 0,
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    "lexicalSenses": 1,
    "glosses": 0
  }
}

Where this record stops

This page does not supply an independently verified sound-change sequence, first-use manuscript or complete family tree unless a cited analysis explicitly establishes one. Missing detail here is a limit of this record—not a claim that humanity knows nothing more.

An older meaning does not determine what a word must mean today. Follow the sources, preserve disagreements, and keep ancestry separate from interpretation.

Contribute located evidence for bro →

Source and snapshot

Imported from Wiktionary contributors; extracted by Tatu Ylonen / Wiktextract / Kaikki.org. Selected fields are reformatted and grouped; wording, source identity and etymology sections are retained. CC-BY-SA-4.0 applies to the imported source material.

Dump: 2026-10-01 · Extracted: 2026-10-30. These are snapshot dates, not the word’s first attestation or the page’s revision date.

Source entry and bibliography ↗Wiktionary revision history ↗Acquisition and rights ledger
Machine-source provenance
Source SHA-256
5ff2c072f8099f2d2ce484bd6957bf179f046d2ad37bc36555edf8bb84cb5291
Import run
73216b9a9b78ed3830994bf853103716f5a4dc57099e371e9f8fdc468facca26
Permanent entry ID
w-YnJv