| baca | bayberry |
| baculum | bacillus |
| badius | baize |
| bajulus | bail, bailiff |
| balteus | belt, belting |
| barba | barb, barbed, barber |
| battuo | abate, abatement, bate, battalion, batter, battering-ram, battery, battle, battle-as, battlefield, battleground, battleship, combat, combatant, combative, debatable, debate, debater, embattle, rebate, unabated |
| beatus | see beo |
| bellus | see bonus |
| bellum | belligerent, duel, duelist, rebel, rebellion, rebellious, revel, reveler, reverlry |
| bene | see bonus |
| beo | beatific, beatitude |
| bestia | beast, beastly, bestial |
| beta | beet |
| bibo | beverage, bib, imbibe |
| bilis | bile, bilious |
| bis | balance, bicarbonate, bicepts, bichloride, bichromate, bicycle, biennial, bigamy, bilateral, billion, bimetallic, bimetallism, binocular, binomial, biscuit, bisect, bivalve, combination, combine, counterbalance, overbalance, unbalance, well-balanced |
| bitumen | bituminous |
| biandus | bland, blandishment, blandly |
| bonus (bel-, ben-) | beau, beauteous, beautifier, beautiful, beautifully, beautify, beauty, beaux, beldam, belladonna, belle, benedict, benediction, benefaction, benefactor, benefactress, benefice, beneficence, beneficent, beneficial, beneficiary, benefit, benevolence, benevolent, bengn, benignant, benignity, benison, bonanza, bonbon, bonny(ie), boon, bounteous, bountiful, bounty, debonair, embellish, embellishment |
| bos | beef, beffsteak, bugle |
| botulus | bowel(s) |
| braca | bracket |
| bractea | bract |
| brevis | abbreviate, abbriviation, abridge, abridgement, breviary, brevity, brief, briefly |
| brutus | buckle, buckler, unbuckle |
| bulla | bill, billboard, billet, billet-doux, boil, boiler, bouillon, budge, bullet, bulletin, bullion, ebullition, handbill, hard-boiled |
| buteo | buzzard |
