- 1. First letter of the Greek alphabet, alpha; used as a classifier in the nomenclature of many sciences. 2. Symbol for Bunsen solubility coefficient. 3. In chemistry, denotes the first in a series, a position immediately adjacent to a carboxyl group, the first of a series of closely related compounds, an aromatic substituent on an aliphatic chain, or the direction of a chemical bond away from the viewer. 4. Abbreviation for alpha particle. 5. In chemistry, symbol for angle of optic rotation; degree of dissociation. For terms beginning with this prefix, see the specific term.* * *see alpha
Medical dictionary. 2011.