| 1 | Latin | bacillus | Alternative form of bacillum; rod-shaped... |
| 2 | Latin | bacillum | A small staff or wand; The shaft or handle of a... |
| 3 | Latin | baculum | walking stick, cane, staff; sceptre, rod; a... |
| 4 | Proto-Indo-European | baḱ- | club, pointed stick, peg; pointed stick, peg |