any of various substances that interfere with the action of the beta receptors: used primarily to reduce the heart rate or force in the prevention, management, or treatment of angina, hypertension, or arrythmias.
- Beta brass
an alloy consisting of nearly equal proportions of copper and zinc.
- Beta carotene
the most abundant of various isomers of carotene, C 40 H 56 , that can be converted by the body to vitamin A.
- Beta cell
B cell (def 2).
- Beta coefficient
beta (def 6). noun (stock exchange) a measure of the extent to which a particular security rises or falls in value in response to market movements