China 
Africa 
- Biphenyl
- Biplot
- Bipolar I disorder
- Bipolar II disorder
- Bipolar Spectrum Diagnostic Scale
- Bipolar cells
- Bipolar depression
- Bipolar disorder
- Bipolar mania
- Bipolar neuron
- Bipyridine
- Birbeck granules
- Birch
- Birch tar
- Bird fancier's lung
- Bird flu
- Birdshot chorioretinopathy
- Birnaviridae
- Birt-Hogg-Dube syndrome
- Birth
- Birth asphyxia
- Birth attendant
- Birth control
- Birth control pills
- Birth defects
- Birth injury
- Birth order
- Birth rate
- Birth spacing
- Birth trauma
- Birth weight
- Bis chloromethyl ether
- Bis-GMA
- Bis-tris propane
- Bisabolene
- Bisabolol
- Bisacodyl
- Bisbiguanide
- Bisdemethoxycurcumin
- Bishop score
- Bismuth
- Bismuth 213
- Bismuth germanate
- Bismuth nitrate
- Bismuth oxychloride
- Bismuth salicylate
- Bismuth subcitrate
- Bismuth subgallate
- Bismuth subsalicylate
- Bismuth sulfide
- Bismuth-209
- Bisoprolol
- Bispecific antibodies
- Bispecific antibody
- Bispecific monoclonal antibody
- Bispectral index
- Bisphenol
- Bisphenol A
- Bisphenol A diglycidyl ether
- Bisphenol F
- Bisphenols
- Bisphosphonate-associated osteonecrosis of the jaw
- Bisphosphonates
- Bisulfide
- Bisulfite sequencing
- Bite
- Bitemporal hemianopsia
- Bitot's spots
- Bitter gourd
- Bittering agent
- Bitumen
- Biuret
- Biuret test
- Bivalirudin
- Bivariate
- Bivatuzumab
- Bixa orellana
- Bixin
- Black carbon
- Black death
- Black eye
- Black fly
- Black gram
- Black nightshade
- Black pepper
- Black sheep
- Black skin
- Black-eyed peas
- Blackberry
- Blackcurrant
- Blackfan Diamond Anemia
- Blackheads
- Blackleg
- Blacklight
- Blackouts
- Bladder
- Bladder augmentation
- Bladder cancer
- Bladder carcinoma
- Bladder disease
- Bladder diverticulum
- Bladder exstrophy
- Bladder neck
- Bladder outlet obstruction
- Bladder rupture
- Bladder spasm
- Bladder sphincter
- Bladder stones
- Bladder training
- Bladder tumor
- Blalock Taussig shunt
- Blanching
- Bland-Altman plot
- Blaschko's lines
- Blast cells
- Blast injury
- Blastema
- Blastic NK cell lymphoma
- Blastocoel
- Blastocoele
- Blastocyst
- Blastodisc
- Blastoma
- Blastomeres
- Blastomyces dermatitidis
- Blastomycosis
- Blastopore
- Blastula
- Blau syndrome
- Bleaching agent
- Bleb
- Blebbing
- Blebbistatin
- Bleeding
- Bleeding diathesis
- Bleeding disorders
- Bleeding on probing
- Bleeding tendency
- Bleeding time
- Blender
- Bleomycin
- Blepharitis
- Blepharochalasis
- Blepharoconjunctivitis
- Blepharophimosis
- Blepharophyma
- Blepharoplasty
- Blepharospasm
- Blight
- Blighted ovum