| Definition (Quotes About) | Arecibo Observatory (astronomy, Puerto Rico) |
| Self-sabotage (Quotes About) | asclepias |
| 3,5-diiodosalicylic acid (organic chemistry) | Aspergillus |
| A New England Nun (Plot Summary) (story) | Australembia rileyi |
| aardwolf | Axolotl (Author Biography) (story) |
| Accelerize New Media Inc | Babesiosis |
| Access Television Network, Inc. (Private Company) | back siphonage |
| Adam (Biblical Figure) | bacon |
| ADF (technology) | bagworm |
| ADM Alliance Nutrition, Inc. (Subsidiary Company) | Balsam beast |
| Aflatoxin | banana |
| African Passions (Style) (story) | barbet |
| Ag Processing Inc (Private - Cooperative Company) | basking shark |
| agglomerated | bedbug |
| Agricultural chemistry (agriculture, forestry, & soils) | bee-eater |
| Agricultural engineering (agriculture, forestry, & soils) | beefeater |
| air mileage unit (engineering) | beet armyworm |
| Ajinomoto Co., Inc. (Public Company) | Bergson, Henri L. (Quotes By) |
| aliment | bittern (bird) |
| Anamia | Black crappie |
| Anaplasmosis (veterinary medicine) | Black-throated huet-huet |
| Animal and marine fats and oils (SIC 2077) (industry) | blood meal |
| Ann Arbor: Communications (city, Michigan) | Boat-billed heron |
| anthobian | bonefish (fish) |
| antioxidant | bottle-feed |
| aphid | bottom feeder |
| aphis lion | bowl-mill pulverizer (mechanical engineering) |
| Aquaculture (agriculture, forestry, & soils) | Brandt's cormorant |
| archerfish (fish) | Brazilian merganser |
| Ardmore (city, Oklahoma) | breastfeed |
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