Balt, Baltic

behead, becalm, bechance, becloud, become, bedaub, bedazzle, bedeck, bedevil, bedight, bedim, bedizen, bedraggle, befall, befit

benediction, benefactor, beneficiary, benefice, beneficence, benefit, benevolent
benign

benzoate, benzoyl

bi-
biangular, biannual, biarticulate, biathlon, biaxial, bicameral, bicarbonate, bicentenary, bicentennial, bicephalous, bicoastal, bicuspid, bicycle, bidirectional, biennial, biennium
bis-
biceps, biscuit, bissextile

bibliography, biblioklept, bibliolatry, bibliology, bibliomancy, bibliomania, bibliopegy, bibliophile, bibliophobia, bibliopole, bibliotheca, bibliothecary

biography, biology, biome, bionics, biopsy, biota, biotic, biocentric, biochemical, biochemist, biochemistry, biocide, bioclimatology, biodegradable, biodiesel, biodiversity, bioethics, biofeedback, biofuel, biogen, biogenic, biogeny, biogeography

botryoid, botryomycosis, botryococcane

brachi- 当brachio- 后的第一个字母是元音时，则o去掉，为brachi-
brachial
brachio-
brachiopod, brachiosaurus

bradycardia, bradykinin, bradykinesia, bradypnea

branchial, branchiopod

bronchoscopy, bronchospasm, bronchoalveolar, bronchodilator

bryology, bryophyte, bryozoan