| B-CLL | B cell Chronic Lymphocytic Leukemia |
| BA | Bio Availability |
| BA Hepato. | Biliary Atresia |
| BAB | Branched Alkyl Benzene |
| BABS | Branched Alkyl Benzene Sulfonate |
| BAC | blood alcohol content |
| BACE | Beta site APP Cleaving Enzyme (AD) |
| BALF | Broncho Alveolar Lavage Fluid |
| BALT | Bronchus Associated Lymphoid Tissue |
| BAP | Bacterial Alkaline Phosphatase |
| BAPED | Bis Amino Propyl Ethylene Diamine |
| BARC | Bottom Anti Reflective Coating |
| BARDA | Biomedical Advanced Research and Development Authority |
| BAS | Bio Active Species |
| BAS | Bile Acid Sequestrants |
| BAT | Baroreflex Activation Therapy |
| BAV | Bovine Adenovirus Vector |
| BAV | balloon aortic valvuloplasty |
| BAW | Bulk Acoustic Wave |
| BBB | Blood-Brain Barrier |
| BBI | Bilirubin-Biliverdin Index |
| BBQ | Bar Be Que |
| BBS | Bardet-Biedl Syndrome |
| BCB | Benzo Cyclo Butene |
| BCC | Biomass Catalytic Cracking |
| BCC | Basal Cell Carcinoma |
| BCCM | Belgian Coordinated Collection of Microorganisms |
| BCG | Bacillus Calmette Guerin |
| BCHE | Butyryl CHolin Esterase |
| BCL | B Cell Lymphomas |
| BCM | Bromo Chloro Methane |
| BCMA | B-Cell Maturation Antigen |
| BCNU | 1,3-Bis(2-Chloroethyl)-1-Nitroso Urea (carmustine, oncology) |
| BCR | B-Cell Receptor |
| BCTMP | Bleached Chemi Thermo Mechanical Pulp (cellulose, pulp) |
| BCV | Bovine Corona Virus |
| BD | Buta Diene |
| BDC | Bone Dry Cellulose (sausage cellulosic packaging) |
| BDDVE | Butane Diol Di Vinyl Ether |
| BDE | Bromo Diphenyl Ether (flame retardant) |
| BDL | Below Detectable Limits |
| BDNF | Brain-Derived Neurotrophic Factor |
| BDO | 1,4-Butane Di Ol |
| BDP | Beclometasone Di Propionate |
| BE | BElgium |
| BEADS | Biodetection Enabling Analyte Delivery System |
| BEC | S-(2-Borono-Ethyl)-L-Cysteine (Sexual DysFunction) |
| BEH | 1-Benzyl-5-Ethoxy Hydantoin |
| BEST | Bio-Electric Stimulation Therapy |
| BET | Brunauer, Emmet & Teller method |
| BEV | Battery Electric Vehicle |
| BEVS | Baculovirus Expression Vector System |
| BFI | Benzo Furanyl Imidazoline |
| BFS | Bankable Feasibility Study |
| BG | BulGaria |
| BGA | N-Benzoyl-L-Glutamic Acid. anhydride. (polymer) |
| BGH | Bovine Growth Hormone |
| BGS | bone graft substitute |
| BHA | Butyl Hydroxyl Anisole |
| BHA | Barium Hexa Aluminate |
| BHEM | Blood Half-life Extending Moiety |
| BHK | Baby Hamster Kidney |
| BHKW | Block Heiz Kraft Werke |
| BHMT | Bis Hexa Methylene Triamine |
| BHS | Breast Histo Scanning |
| BHT | Butyl Hydroxyl Toluene |
| BHV | Bovine Herpes Virus |
| BIA | Benzyl Isoquinoline Alkaloids |
| BIC | Board In Cable |
| BIFC | BImolecular Fluorescence Complementation |
| BIM | Building Information Modeling |
| BIMS | Brominated Isobutylene/para-Methyl Styrene |
| BINAP | 2,2'-BIs(diphenylphosphino)-1,1'-biNAPhthyl |
| BINOL | 2,2'-Bis(diphenylphosphino)-1,1'-binaphthol |
| BIO | Biotechnology Industry Organization (USA) |
| BIOL | Biological |
| BIOPHARMA | Biopharmaceutical |
| BIPA | Botrocetin Induced Platelet Aggregation |
| BIPV | Building Integrated Photo Voltaics |
| BIT | Benz Iso Thiazolin |
| BIT | 1,2-Benz Iso Thiazolin-3-one |
| BiTE | Bi specific T cell Engagers |
| BK | Brady Kinin |
| BKM | Best Known Method |
| BL | Burkitt's Lymphoma |
| BLA | Biologics License Application |
| BLyS | B Lymphocyte Stimulator (protein) |
| BMA | Bis Methyl Amide |
| BMA Ortho. | Bone Marrow Aspirate |
| BMAC | Breath Methylated Alkane Contour (Medical Diag.) |
| bMAP | bio Motion Assessment Platform |
| BMC | Bis Mercaptoacetamido Cyclohexane |
| BMC | Bulk Molding Compound |
| BMD | Bacitracin Methylene Disalicylate |
| BMD Osteop | Bone Mineral Density |
| BME | Bio Medical Engg. |
| BMI | Body Mass Index |
| BMP | Bone Morphogenetic Protein |
| BMS | Bare Metal Stent |
| BMS | Battery Man. System |
| BMS | Building MAN. System |
| BMT | Bone Marrow Transplantation |
| BNA | Bridged Nucleic Acid |
| BNCT | Boron Neutron Capture Therapy |
| BOC | tert-Butyl Oxy Carbonyl |
| BOCLE | Ball On Cylinder Lubricity Evaluator |
| BOF | Basic Oxygen Flow |
| BOGF | Basic Osteoblast Growth Factor |
| BOO | Bladder Outlet Obstruction |
| BOPP | Boronated Proto Porphyrin |
| BOPP | Biaxially Oriented Poly Propylene |
| BOS | Basic Oxygen Steelmaking |
| BOS | Balance Of Systems |
| BOS Pneumo | Bronchiolitis Obliterans Syndrome |
| BOV | Bleeding Oesophageal Varices |
| BP | Butoxy Propanol |
| BP Cardio. | Blood Pressure |
| BP1D | BiPolar 1 Dis |
| BPA | Borono Phenyl Alanine |
| BPA | Bis Phenol A |
| BPA | Business Process Applications |
| BPD | Bi Phenyl Dithiol |
| BPD Lung | BronchoPulmonary Dysplasia |
| BPD Psychi | BiPolar Dis |
| BPDA | 3,3'-4,4'-Bi Phenyltetracarboxylic Di Anhydride |
| BPDCN | blastic plasmacytoid dendritic cell neoplasm |
| BPDE | 4,4'-Bis(2,3,4,5,6-Pentafluorobenzoyl Diphenyl Ether |
| BPE | Bis Phosphonate Esters |
| BPEM | 2-Bromo Propionyloxy Ethyl Methacrylate |
| BPH | Benign Prostate Hyperplasia |
| BPI | Bactericidal Permeability Increasing protein |
| BPL | Broadband Power Line |
| BPO | Business Process Outsourcing |
| BPO | Benzoyl Per Oxide |
| BPP | Butoxy Propoxy Propanol |
| BPSG | Boro Phospho Silicate Glass |
| BPTI | Bovine Pancreatic Trypsin Inhibitor |
| BR | BRasil |
| BRCA | BReast CAncer |
| BRCAm | BRCA mutated |
| BRD | Bovine Respiratory Disease |
| BRM | Biological Response Modifier |
| BRSV | Bovine Respiratory Syncytial Virus |
| BSA | Bovine Serum Albumin |
| BSB | 1-Bromo-2,5-bis-[3-(COOH)-4-(OH)]-Styryl Benzene |
| BSE | Bovine Spongiform Encephalitis |
| BST | Bovine Somato Tropin |
| Bt | Bacillus Thuringiensis |
| BTAI | Blunt Thoracic Aortic Injury |
| BTBAS | Bis Tertiary Butyl Amine Silane |
| BTC | Bis Trichloromethyl Carbonate |
| BTC Onco. | Biliary Tract Cancer |
| BTDA | 3,3'-4,4'-Benzophenone Tetracarboxylic acid Di Anhydride |
| BTI | Bacillus Thuringiensis Israelensis |
| BTK | Below-The-Knee |
| BTK Onco | Bruton s Tyrosine Kinase |
| BTKi | BTK inhibitor |
| BTL | BioMass To Liquids |
| BTMP | Bis Trifluoro Methyl Phenylethanol |
| BTO | Business Technology Optimization |
| BTT | Brain Thermal Tunnel |
| BTT Cardio | Bridge To Transplant |
| BTTN | Butane Triol Tri Nitrate |
| BTX | Benzene Toluene Xylene |
| BTX | Botulinum ToXin |
| Bu | Butyl |
| BUS | BUSiness |
| BV | Bacteria or Virus infection |
| BV Vaginos | Bacterial Vaginosis |
| BVA | Blood Volume Analysis |
| BVDV | Bovine Viral Diarrhea Virus |
| BVDV | Bovine Viral Diarrhea Virus |
| BVS | Bioresorbable Vascular Scaffold |
| BW | Business Wire |
| BWFI | Bacteriostatic Water For Injection |
| BX | Benzo Xazinoid |