| COB | adult male swan |
|---|---|
| COB | white gull having a black back and wings |
| COB | stocky short-legged harness horse |
| COB | nut of any of several trees of the genus Corylus |
| COB | a B vitamin that is used to treat pernicious anemia |
| COB | a hard ferromagnetic silver-white bivalent or trivalent metallic element |
| COB | a radioactive isotope of cobalt with mass number 60 |
| COB | a shade of blue tinged with green |
| COB | greenish-blue pigment consisting essentially of cobalt oxide and alumina |
| COB | greenish-blue pigment consisting essentially of cobalt oxide and alumina |
| COB | a rare silvery-white mineral |
| COB | Australian term for a pal |