| Abbreviation | Definition |
|---|---|
| AA | Amyloid Associated |
| AAAD | Aromatic Amino Acid Decarboxylase |
| AAAS | American Association for the Advancement of Science |
| AAC | ADP/ATP carrier |
| AAC | Amino Acid Composition |
| ABC | Across Breed Comparison |
| ABD | Actin Binding Domain |
| ABG | American Barley Genomic |
| ABI | Applied Biosystems, Inc. |
| ABIC | Agricultural Biotechnology International Conference |
| ABMT | Autologous Bone Marrow Transplantation |
| ABRF | Association of Biomolecular Resource Facilities |
| ABS | chromosome aberration(s) |
| ACAS | Adherent Cell Analysis and Sorting |
| ACB | A Choose B |
| ACDB | African Centre for DNA Barcoding |
| ACDS | Acetyl Coenzyme-A Decarboxylase Synthase |
| ACE | Angiotensin Converting Enzyme |
| ACEDB | A C. elegans database |
| ACGC | Accreditation Council for Genetic Counseling |