1. Wild and domestic cattle; in some classifications placed in the subfamily Bovinae or tribe Bovini
   - genus Bos

1. An informal form of address for a man
   "Say, bo, what are you doing?";
   - fellow, dude [informal], buster [informal], matey [Brit, informal], cock [Brit, informal], bruv [UK, informal], bro [US, informal]

Type of: adult male, bozo [N. Amer, informal], cat [N. Amer, informal], chappie [Brit, informal], geezer [Brit, informal], guy [informal], hombre [N. Amer, informal], mammal genus, man, sod [informal]

Part of: Bovidae, family Bovidae

Encyclopedia: Bos, Mark