English word brother comes from Proto-Indo-European *bʰreh₂trós, and later Proto-Germanic *brōþēr (Brother.)
| Dictionary entry | Language | Definition |
|---|---|---|
| *bʰreh₂trós | Proto-Indo-European (ine) | |
| *brōþēr | Proto-Germanic (gem-pro) | Brother. |
| brōþor | Old English (ang) | |
| broþor | Old English (ang) | Brother. |
| brother | Middle English (enm) | Brother. |
| brother | English (en) | (transitive) To treat as a brother. Expressing exasperation. (African American Vernacular English) A black male.. A male fellow member of a religious community, church, trades union etc.. A male having at least one parent in common with another (see half-brother, stepbrother).. Someone who is a peer, whether male or female.. Son of the same parents as another person. |