| 1 | English | carboxyl | A univalent functional group consisting of a... |
| 2 | English | carbonyl | In organic chemistry, a divalent functional... |
| 3 | English | carbon | The chemical element with an atomic number of 6.... |
| 4 | English | budget | The amount of money or resources earmarked for a... |
| 5 | Middle English | bogett | — |
| 6 | Old French | bougette | — |
| 7 | Old French | bouge | sack; purse; small bag |
| 8 | Latin | bulga | knapsack, wallet, satchel; wallet, purse; womb |
| 9 | Gaulish | bolgā | bag, sack |
| 10 | Proto-Celtic | bolgos | sack, bag; stomach |
| 11 | Proto-Indo-European | bʰelǵʰ- | to swell |
| 12 | Proto-Indo-European | bʰel- | to sound; to speak, roar, bark; shiny, white; to... |
| 13 | Proto-Indo-European | bʰōl- | — |